JP5699990B2 - Method for producing organoxysilane compound having piperazinyl group and piperazine compound - Google Patents

Description

  The present invention relates to a method for producing an organoxysilane compound having a piperazinyl group useful as a resin additive, a paint additive, an adhesive, a silane coupling agent, a fiber treatment agent, and a surface treatment agent, and a piperazine compound.

  Organoxysilane compounds having amino groups are useful as resin additives, paint additives, adhesives, silane coupling agents, fiber treatment agents, surface treatment agents, and as such organoxysilane compounds having amino groups. Are organoxysilane compounds having a primary amino group such as aminopropyltrimethoxysilane, organoxysilane compounds having a secondary amino group such as N-phenylaminopropyltrimethoxysilane, and dimethylaminopropyltrimethoxysilane. An organoxysilane compound having a tertiary amino group such as is known.

  Among the above-mentioned organoxysilane compounds having an amino group, an organoxysilane compound having a piperazinyl group such as N- (3-methyldimethoxysilyl) piperazine described in Patent Document 1 (JP-A-4-214470) is yellow. There is a description that it is useful as a fiber treatment agent that does not change and can impart softness.

  However, as in Patent Document 1, generally an organoxysilane compound having a piperazinyl group can be produced by the reaction of piperazine and a haloalkylorganoxyxysilane compound, but piperazine is a solid having a melting point of 108 ° C and a boiling point of 144 ° C, and Since it is hardly soluble in organic solvents, piperazine sublimates and the distillation column and distillation line are clogged when distillation purification is carried out after the reaction, making it difficult to industrially manufacture.

  Also, since piperazine has two reactive sites with the haloalkylorganoxysilane compound, it is necessary to use a large amount of piperazine to improve the selectivity of the desired organoxysilane compound having a piperazinyl group. The problem of piperazine sublimation and blockage becomes more pronounced.

JP-A-4-214470

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for producing an organoxysilane compound having a piperazinyl group and a piperazine compound that can be industrially implemented without causing blockage of piperazine during distillation. And

  As a result of intensive investigations to achieve the above object, the present inventors have reacted a haloalkylorganoxyxysilane compound with a piperazine compound protected with a specific silyl group, and then silylated to produce a distillation column or distillation column. It has been found that an organoxysilane compound having a piperazinyl group can be efficiently produced without causing the problem of blockage of piperazine in the outlet line, and the present invention has been completed.

（式中、Ｒ¹は炭素数１〜２０の直鎖状又は分岐鎖状の２価炭化水素基であり、Ｒ²及びＲ³は炭素数１〜２０の非置換又は置換の１価炭化水素基であり、Ｘはハロゲン原子であり、ｎは０、１又は２である。）
で示されるオルガノキシシラン化合物と下記一般式（２）

（式中、Ｒ⁴、Ｒ⁵及びＲ⁶は炭素数１〜２０の非置換又は置換の１価炭化水素基である。）
で示されるシリル基で保護されたピペラジン化合物を反応させて、下記一般式（３）

（式中、Ｒ¹、Ｒ²、Ｒ³、Ｒ⁴、Ｒ⁵、Ｒ⁶及びｎは、上記と同様である。）
で示されるシリル基で保護されたピペラジニル基を有するオルガノキシシラン化合物を得た後、この式（３）のオルガノキシシラン化合物を脱シリル化することを特徴とする、下記一般式（４）

（式中、Ｒ¹、Ｒ²、Ｒ³及びｎは、上記と同様である。）
で示されるピペラジニル基を有するオルガノキシシラン化合物の製造方法。
〔２〕
上記一般式（２）のＲ⁴、Ｒ⁵及びＲ⁶が炭素数３〜２０の非置換又は置換の２級もしくは３級炭化水素基である〔１〕記載のピペラジニル基を有するオルガノキシシラン化合物の製造方法。
〔３〕
下記一般式（５）

（式中、Ｒ⁷、Ｒ⁸及びＲ⁹は炭素数３〜２０の非置換又は置換の２級もしくは３級炭化水素基である。）
で示されるシリル基で保護されたピペラジン化合物。
〔４〕
Ｒ⁷、Ｒ⁸及びＲ⁹が全てイソプロピル基であるか又は全てｓｅｃ−ブチル基である〔３〕記載のシリル基で保護されたピペラジン化合物。 Therefore, this invention provides the manufacturing method and piperazine compound of the organoxysilane compound which has a piperazinyl group shown below.
[1]
The following general formula (1)

(In the formula, R ¹ is a linear or branched divalent hydrocarbon group having 1 to 20 carbon atoms, and R ² and R ³ are unsubstituted or substituted monovalent hydrocarbon having 1 to 20 carbon atoms. A group, X is a halogen atom, and n is 0, 1 or 2.)
And the following general formula (2)

(In the formula, R ⁴ , R ⁵ and R ⁶ are each an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms.)
A piperazine compound protected with a silyl group represented by the following general formula (3):

(In the formula, R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ and n are the same as described above.)
The organoxysilane compound having a piperazinyl group protected with a silyl group represented by formula (3) is obtained, and then the organoxysilane compound represented by the formula (3) is desilylated.

(In the formula, R ¹ , R ² , R ³ and n are the same as described above.)
The manufacturing method of the organoxysilane compound which has a piperazinyl group shown by these.
[2]
The organoxysilane compound having a piperazinyl group according to [1], wherein R ⁴ , R ⁵ and R ^{6 in the} general formula (2) are unsubstituted or substituted secondary or tertiary hydrocarbon groups having 3 to 20 carbon atoms. Manufacturing method.
[3]
The following general formula (5)

(In the formula, R ⁷ , R ⁸ and R ⁹ are unsubstituted or substituted secondary or tertiary hydrocarbon groups having 3 to 20 carbon atoms.)
A piperazine compound protected with a silyl group represented by the formula:
[4]
The piperazine compound protected with a silyl group according to [3], wherein R ⁷ , R ⁸ and R ⁹ are all isopropyl groups or all sec-butyl groups.

  According to the production method of the present invention, an organoxysilane compound having a piperazinyl group useful as a resin additive, a paint additive, an adhesive, a silane coupling agent, a fiber treatment agent, and a surface treatment agent is efficiently produced. Can do.

1 is a ¹ H-NMR spectrum of N-triisopropylsilylpiperazine obtained in Example 1. 2 is an IR spectrum of N-triisopropylsilylpiperazine obtained in Example 1. 2 is a ¹ H-NMR spectrum of N-tri (sec-butyl) silylpiperazine obtained in Example 3. 4 is an IR spectrum of N-tri (sec-butyl) silylpiperazine obtained in Example 3.

（式中、Ｒ¹は炭素数１〜２０の直鎖状又は分岐鎖状の２価炭化水素基であり、Ｒ²及びＲ³は炭素数１〜２０の非置換又は置換の１価炭化水素基であり、Ｘはハロゲン原子であり、ｎは０、１又は２である。）
で示されるオルガノキシシラン化合物と下記一般式（２）

（式中、Ｒ⁴、Ｒ⁵及びＲ⁶は炭素数１〜２０の非置換又は置換の１価炭化水素基である。）
で示されるシリル基で保護されたピペラジン化合物を反応させて、下記一般式（３）

（式中、Ｒ¹、Ｒ²、Ｒ³、Ｒ⁴、Ｒ⁵、Ｒ⁶及びｎは、上記と同様である。）
で示されるシリル基で保護されたピペラジニル基を有するオルガノキシシラン化合物を得た後、この式（３）のオルガノキシシラン化合物を脱シリル化し、下記一般式（４）

（式中、Ｒ¹、Ｒ²、Ｒ³及びｎは、上記と同様である。）
で示されるピペラジニル基を有するオルガノキシシラン化合物を得るものである。 The method for producing an organoxysilane compound having a piperazinyl group according to the present invention is represented by the following general formula (1).

(In the formula, R ¹ is a linear or branched divalent hydrocarbon group having 1 to 20 carbon atoms, and R ² and R ³ are unsubstituted or substituted monovalent hydrocarbon having 1 to 20 carbon atoms. A group, X is a halogen atom, and n is 0, 1 or 2.)
And the following general formula (2)

(In the formula, R ⁴ , R ⁵ and R ⁶ are each an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms.)
A piperazine compound protected with a silyl group represented by the following general formula (3):

(In the formula, R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ and n are the same as described above.)
After obtaining an organoxysilane compound having a piperazinyl group protected by a silyl group represented by formula (3), the organoxysilane compound of the formula (3) is desilylated to give the following general formula (4)

(In the formula, R ¹ , R ² , R ³ and n are the same as described above.)
The organoxysilane compound which has a piperazinyl group shown by these is obtained.

In the general formula (1), as the linear or branched divalent hydrocarbon group having 1 to 20 carbon atoms represented by R ¹ , specifically, a methylene group, a dimethylene group, a trimethylene group, tetra Examples thereof include alkylene groups such as a methylene group, hexamethylene group, octamethylene group, decamethylene group and isobutylene group, arylene groups such as a phenylene group, and aralkylene groups such as a methylenephenylene group and a methylenephenylenemethylene group.

R ² and R ³ are each an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, and examples thereof include linear, branched or cyclic alkyl groups, alkenyl groups, aryl groups, and aralkyl groups. . Specifically, straight chain such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, decyl, dodecyl, tetradecyl, hexadecyl, octadecyl, icosyl, etc. -Like alkyl groups, isopropyl groups, isobutyl groups, sec-butyl groups, tert-butyl groups, texyl groups, 2-ethylhexyl groups and other branched alkyl groups, cyclopentyl groups, cyclohexyl groups and other cyclic alkyl groups, vinyl Group, an alkenyl group such as an allyl group and a propenyl group, an aryl group such as a phenyl group and a tolyl group, an aralkyl group such as a benzyl group and the like, and a methyl group and an ethyl group are particularly preferable. Moreover, a part or all of the hydrogen atoms of the hydrocarbon group may be substituted. Specific examples of the substituent include alkoxy groups such as a methoxy group, an ethoxy group, and an (iso) propoxy group; Halogen atoms such as fluorine atom, chlorine atom, bromine atom and iodine atom; cyano group; amino group; aryl group having 6 to 18 carbon atoms such as phenyl group and tolyl group; 7 to 18 carbon atoms such as benzyl group and phenethyl group An aralkyl group; an acyl group having 2 to 18 carbon atoms; an alkylsilyl group; an alkoxysilyl group, and further an ester group, an ether group, a sulfide group, or the like may be interposed, and these may be used in combination. .

  X is a halogen atom, and specific examples include a chlorine atom, a bromine atom, and an iodine atom.

  Specific examples of the organoxysilane compound represented by the general formula (1) include chloromethyltrimethoxysilane, chloromethylmethyldimethoxysilane, chloromethyldimethylmethoxysilane, chloromethyltriethoxysilane, chloromethylmethyldiethoxysilane, chloro Methyldimethylethoxysilane, bromomethyltrimethoxysilane, bromomethylmethyldimethoxysilane, bromomethyldimethylmethoxysilane, bromomethyltriethoxysilane, bromomethylmethyldiethoxysilane, bromomethyldimethylethoxysilane, iodomethyltrimethoxysilane, iodomethyl Methyldimethoxysilane, iodomethyldimethylmethoxysilane, iodomethyltriethoxysilane, iodomethylmethyldiethoxysilane, iodomethyl Methylethoxysilane, 3-chloropropyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyldimethylmethoxysilane, 3-chloropropyltriethoxysilane, 3-chloropropylmethyldiethoxysilane, 3-chloropropyldimethyl Ethoxysilane, 3-bromopropyltrimethoxysilane, 3-bromopropylmethyldimethoxysilane, 3-bromopropyldimethylmethoxysilane, 3-bromopropyltriethoxysilane, 3-bromopropylmethyldiethoxysilane, 3-bromopropyldimethylethoxy Silane, 3-iodopropyltrimethoxysilane, 3-iodopropylmethyldimethoxysilane, 3-iodopropyldimethylmethoxysilane, 3-iodopropyltriethoxysilane Down, 3-iodo-propyl methyl diethoxy silane, 3-iodo-propyl dimethyl ethoxy silane, and the like.

R ⁴ , R ^5, and R ⁶ in the general formula (2) include the same substituents as those exemplified for R ¹ or R ² , and are particularly unsubstituted or substituted 2 having 3 to 20 carbon atoms. A tertiary or tertiary hydrocarbon group is preferable, and among them, an isopropyl group, a sec-butyl group, a cyclopentyl group, a cyclohexyl group, a tert-butyl group, and a texyl group are more preferable. This is because the elimination reaction (side reaction) of the silyl group that occurs when reacting with the organoxysilane compound represented by the general formula (1) can be suppressed.

  Specific examples of the piperazine compound protected by the silyl group represented by the general formula (2) include N-trimethylsilylpiperazine, N-hexyldimethylsilylpiperazine, N-decyldimethylsilylpiperazine, N-triethylsilylpiperazine, N- Triisobutylsilylpiperazine, Nt-butyldimethylsilylpiperazine, Nt-butyldiphenylsilylpiperazine, N-triisopropylsilylpiperazine, N-tri (sec-butyl) silylpiperazine, N-tricyclopentylsilylpiperazine, N- Tricyclohexylsilylpiperazine, N-triphenylsilylpiperazine, N-tritolylsilylpiperazine, N-trit-butylsilylpiperazine, Nt-butyldiisopropylsilylpiperazine, Nt-butyldi (s c-butyl) silylpiperazine, Nt-butyldicyclopentylsilylpiperazine, Nt-butyldicyclohexylsilylpiperazine, N-texyldiisopropylsilylpiperazine, N-texyldi (sec-butyl) silylpiperazine, N-texyldicyclopentyl Examples include silyl piperazine, N-texyl dicyclohexyl silyl piperazine and the like, in particular, N-triisopropylsilyl piperazine, N-tri (sec-butyl) silyl piperazine, N-tricyclopentyl silyl piperazine, N-tricyclohexyl silyl piperazine, N- Triphenylsilylpiperazine, N-tritolylsilylpiperazine, N-trit-butylsilylpiperazine, Nt-butyldiisopropylsilylpiperazine, Nt-butyldi (sec- Cyl) silylpiperazine, Nt-butyldicyclopentylsilylpiperazine, Nt-butyldicyclohexylsilylpiperazine, N-texyldiisopropylsilylpiperazine, N-texyldi (sec-butyl) silylpiperazine, N-texyldicyclopentylsilylpiperazine N-Texyldicyclohexylsilylpiperazine is preferred.

  The compounding ratio of the organoxysilane compound represented by the general formula (1) and the piperazine compound protected by the silyl group represented by the general formula (2) is not particularly limited, but in terms of reactivity and productivity, The amount of the piperazine compound protected by the silyl group represented by the general formula (2) is 0.2 to 4 moles, particularly 0.5 to 2 moles per mole of the organoxysilane compound represented by the formula (1). preferable.

  Although the reaction temperature of the said reaction is not specifically limited, 0-200 degreeC, especially 20-150 degreeC is preferable, Reaction time is not specifically limited, However, 1-40 hours, Especially 1-20 hours are preferable. The reaction atmosphere is preferably an inert gas atmosphere such as nitrogen or argon.

  In addition, although the said reaction advances even without a solvent, a solvent can also be used. Solvents used include hydrocarbon solvents such as pentane, hexane, cyclohexane, heptane, isooctane, benzene, toluene and xylene, ether solvents such as diethyl ether, tetrahydrofuran and dioxane, and ester solvents such as ethyl acetate and butyl acetate. And aprotic polar solvents such as acetonitrile, N, N-dimethylformamide and N-methylpyrrolidone, and chlorinated hydrocarbon solvents such as dichloromethane and chloroform. These solvents may be used alone or in combination of two or more.

Desilylation is carried out by reacting with a compound having an active proton.
Examples of the compound having an active proton used include alcohol compounds such as methanol, ethanol, 1-propanol, 2-propanol and ethylene glycol, phenol compounds such as phenol and cresol, and carboxylic acid compounds such as acetic acid and propionic acid. .

  The amount of the compound having an active proton to be used is not particularly limited, but 0.2 to 10 mol of the compound having an active proton is used per 1 mol of the piperazine compound protected by the silyl group represented by the general formula (2). In particular, the range of 0.5 to 5 mol is preferable.

  The temperature of desilylation reaction can be 0-200 degreeC, and reaction time is 1 to 40 hours normally. The reaction atmosphere is preferably an inert gas atmosphere such as nitrogen or argon.

  The desilylation proceeds even without a catalyst, but a catalyst can be used for the purpose of improving the reaction rate. Examples of the catalyst used include sulfuric acid, methanesulfonic acid, benzenesulfonic acid, toluenesulfonic acid, dodecylbenzenesulfonic acid, sulfonic acid compounds such as trifluoromethanesulfonic acid, hydrochloric acid, nitric acid, and salts of the above acids.

  The amount of the catalyst used is not particularly limited, but from the viewpoint of reactivity and productivity, 0.0001 to 0.1 mol, in particular, per 1 mol of the piperazine compound protected by the silyl group represented by the general formula (1). A range of 0.001 to 0.05 mol is preferred.

  In addition, although the said reaction advances even without a solvent, a solvent can also be used. Solvents used include hydrocarbon solvents such as pentane, hexane, cyclohexane, heptane, isooctane, benzene, toluene and xylene, ether solvents such as diethyl ether, tetrahydrofuran and dioxane, and ester solvents such as ethyl acetate and butyl acetate. And aprotic polar solvents such as acetonitrile, N, N-dimethylformamide and N-methylpyrrolidone, and chlorinated hydrocarbon solvents such as dichloromethane and chloroform. These solvents may be used alone or in combination of two or more.

  By the desilylation reaction, an organoxysilane compound having a piperazinyl group represented by the general formula (4) is obtained. Specific examples of the organoxysilane compound having a piperazinyl group represented by the general formula (4) include N-trimethoxysilylmethylpiperazine, N-methyldimethoxysilylmethylpiperazine, N-dimethylmethoxysilylmethylpiperazine, N- Triethoxysilylmethylpiperazine, N-methyldiethoxysilylmethylpiperazine, N-dimethylethoxysilylmethylpiperazine, N- (3-trimethoxysilylpropyl) piperazine, N- (3-methyldimethoxysilylpropyl) piperazine, N- ( 3-dimethylmethoxysilylpropyl) piperazine, N- (3-triethoxysilylpropyl) piperazine, N- (3-methyldiethoxysilylpropyl) piperazine, N- (3-dimethylethoxysilylpropyl) piperazine, etc. It is shown.

In the present invention, the piperazine compound protected with the silyl group represented by the general formula (5) is prepared by converting piperazine into, for example, an R ⁷ R ⁸ R ⁹ Si— group (wherein R ⁷ , R ⁸ and R ⁹ are It is obtained by silylation with a silylating agent having the same as above.

The silylating agent used is R ¹ R ² R ³ SiX such as triisopropylchlorosilane, triisopropylbromosilane, triisopropyliodosilane (R ¹ , R ² and R ³ are the same as above, and X is chlorine And a silyl trifluoromethane sulfonic acid compound such as triisopropylsilyl trifluoromethane sulfonic acid.

  The compounding ratio of piperazine and silylating agent is not particularly limited. However, from the viewpoint of reactivity and productivity, the silylating agent is 0.2 to 4 mol, particularly 0 in terms of the number of moles of silyl group with respect to 1 mol of piperazine. The range of 0.5 to 1.5 mol is preferred.

  Although the reaction temperature of the said reaction is not specifically limited, 0-200 degreeC, especially 20-150 degreeC is preferable, Reaction time is not specifically limited, However, 1-40 hours, Especially 1-20 hours are preferable. The reaction atmosphere is preferably an inert gas atmosphere such as nitrogen or argon.

  In addition, although the said reaction advances even without a solvent, a solvent can also be used. Solvents used include hydrocarbon solvents such as pentane, hexane, cyclohexane, heptane, isooctane, benzene, toluene and xylene, ether solvents such as diethyl ether, tetrahydrofuran and dioxane, and ester solvents such as ethyl acetate and butyl acetate. And aprotic polar solvents such as acetonitrile, N, N-dimethylformamide and N-methylpyrrolidone, and chlorinated hydrocarbon solvents such as dichloromethane and chloroform. These solvents may be used alone or in combination of two or more.

  In this reaction, a catalyst can also be used for the purpose of improving the reaction rate. Examples of the catalyst used include sulfuric acid, methanesulfonic acid, benzenesulfonic acid, toluenesulfonic acid, dodecylbenzenesulfonic acid, sulfonic acid compounds such as trifluoromethanesulfonic acid, hydrochloric acid, nitric acid, and salts of the above acids.

  The amount used is not particularly limited, but from the viewpoint of reactivity and productivity, a range of 0.0001 to 0.1 mol, particularly 0.001 to 0.05 mol is preferable with respect to 1 mol of piperazine.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.

[Example 1] N-triisopropylsilylpiperazine In a flask equipped with a stirrer, a reflux condenser, a dropping funnel and a thermometer, piperazine 189.4 g (2.2 mol), xylene 200 ml, methanesulfonic acid 1.0 g (0 .01 mol) was charged and heated to 130 ° C. After the internal temperature was stabilized, 192.8 g (1.0 mol) of triisopropylchlorosilane was added dropwise over 2 hours and stirred at that temperature for 10 hours. After cooling to room temperature, 500 g of a 10% by mass aqueous sodium hydroxide solution was added, and the organic layer was separated and distilled to obtain 132.6 g of a fraction having a boiling point of 109-111 ° C./0.4 kPa.

A mass spectrum, ¹ H-NMR spectrum, and IR spectrum of the obtained fraction were measured.
Mass spectrum m / z 242,199,170,157,73,59
¹ H-NMR spectrum (deuterated chloroform solvent)
A chart is shown in FIG.
IR spectrum FIG. 2 is a chart.
From the above results, it was confirmed that the obtained compound was N-triisopropylsilylpiperazine.

Example 2 Synthesis of N- (3-trimethoxysilylpropyl) piperazine using N-triisopropylsilylpiperazine as a raw material A flask equipped with a stirrer, a refluxer, a dropping funnel and a thermometer was obtained in Example 1. The obtained N-triisopropylsilylpiperazine (48.5 g, 0.2 mol), triethylamine (22.3 g, 0.22 mol), and toluene (60 ml) were charged and heated to 90 ° C. After the internal temperature was stabilized, 39.7 g (0.2 mol) of 3-chloropropyltrimethoxysilane was added dropwise over 2 hours, followed by stirring at 90-110 ° C. for 6 hours. After filtering the reaction solution, 9.6 g of methanol was added to the filtrate and stirred at 60-70 ° C. for 12 hours to carry out desilylation reaction. The reaction solution was distilled to obtain 33.1 g of N- (3-trimethoxysilyl) propylpiperazine as a fraction having a boiling point of 112 ° C./0.4 kPa. During the distillation, no piperazine was deposited on the column and the distillation line.

[Example 3] N-tri (sec-butyl) silylpiperazine In a flask equipped with a stirrer, a reflux condenser, a dropping funnel and a thermometer, piperazine 189.4 g (2.2 mol), xylene 200 ml, methanesulfonic acid 1 .9 g (0.02 mol) was charged and heated to 130 ° C. After the internal temperature was stabilized, 234.9 g (1.0 mol) of tri (sec-butyl) chlorosilane was added dropwise over 2 hours and stirred at that temperature for 24 hours. After cooling to room temperature, 500 g of a 10% by mass aqueous sodium hydroxide solution was added, and the organic layer was separated and distilled to obtain 153.6 g of a fraction having a boiling point of 123 to 125 ° C./0.2 kPa.

A mass spectrum, ¹ H-NMR spectrum, and IR spectrum of the obtained fraction were measured.
Mass spectrum m / z 284, 227, 171, 85, 59
¹ H-NMR spectrum (deuterated chloroform solvent)
FIG. 3 shows a chart.
IR spectrum FIG. 4 is a chart.
From the above results, it was confirmed that the obtained compound was N-tri (sec-butyl) silylpiperazine.

[Example 4] Synthesis of N- (3-trimethoxysilylpropyl) piperazine using N-tri (sec-butyl) silylpiperazine as a raw material A flask equipped with a stirrer, a refluxer, a dropping funnel and a thermometer was used. N-tri (sec-butyl) silylpiperazine obtained in Example 3 (56.9 g, 0.2 mol), triethylamine (22.3 g, 0.22 mol), and toluene (60 ml) were charged and heated to 90 ° C. After the internal temperature was stabilized, 39.7 g (0.2 mol) of 3-chloropropyltrimethoxysilane was added dropwise over 2 hours, followed by stirring at 90-110 ° C. for 6 hours. After filtering the reaction solution, 9.6 g of methanol was added to the filtrate and stirred at 60-70 ° C. for 24 hours to carry out desilylation reaction. The reaction solution was distilled to obtain 30.5 g of N- (3-trimethoxysilyl) propylpiperazine as a fraction having a boiling point of 112 ° C./0.4 kPa. During the distillation, no piperazine was deposited on the column and the distillation line.

Example 5 Synthesis of N- (3-trimethoxysilylpropyl) piperazine using N-triethylsilylpiperazine as a raw material In a flask equipped with a stirrer, a refluxer, a dropping funnel and a thermometer, 189.4 g (2 2 mol) and 200 ml of xylene were charged and heated to 130 ° C. After the internal temperature was stabilized, 150.7 g (1.0 mol) of triethylchlorosilane was added dropwise over 2 hours and stirred at that temperature for 2 hours. After cooling to room temperature, 500 g of a 10% by mass aqueous sodium hydroxide solution was added, and the organic layer was separated and distilled. 106.0 g of N-triethylsilylpiperazine was obtained as a fraction having a boiling point of 90-91 ° C./0.4 kPa.
Subsequently, 40.1 g (0.2 mol) of the obtained N-triethylsilylpiperazine, 22.3 g (0.22 mol) of triethylamine, 60 ml of toluene were added to a flask equipped with a stirrer, a reflux condenser, a dropping funnel and a thermometer. And heated to 90 ° C. After the internal temperature was stabilized, 39.7 g (0.2 mol) of 3-chloropropyltrimethoxysilane was added dropwise over 2 hours, followed by stirring at 90-110 ° C. for 6 hours. After filtering the reaction solution, 9.6 g of methanol was added to the filtrate and stirred at 60-70 ° C. for 6 hours to carry out desilylation reaction. The reaction solution was distilled to obtain 29.7 g of N- (3-trimethoxysilyl) propylpiperazine as a fraction having a boiling point of 112 ° C./0.4 kPa. During the distillation, no piperazine was deposited on the column and the distillation line.

Comparative Example 1 Synthesis of N- (3-trimethoxysilylpropyl) piperazine using piperazine as a raw material In a flask equipped with a stirrer, a refluxer, a dropping funnel and a thermometer, 51.7 g (0.6 mol) of piperazine 60 ml of toluene was charged and heated to 110 ° C. After the internal temperature was stabilized, 39.7 g (0.2 mol) of 3-chloropropyltrimethoxysilane was added dropwise over 2 hours and stirred at that temperature for 6 hours. After filtering the reaction solution, the filtrate was distilled. During the distillation, precipitation of piperazine was confirmed in the distillation column and the distillation line, and it was necessary to perform an operation of heating and melting the piperazine in order to prevent clogging of the distillation column and the distillation line. 25.5 g of N- (3-trimethoxysilylpropyl) piperazine was obtained as a fraction having a boiling point of 112 ° C./0.4 kPa.

Claims (4)

The following general formula (1)

(In the formula, R ¹ is a linear or branched divalent hydrocarbon group having 1 to 20 carbon atoms, and R ² and R ³ are unsubstituted or substituted monovalent hydrocarbon having 1 to 20 carbon atoms. A group, X is a halogen atom, and n is 0, 1 or 2.)
And the following general formula (2)

(In the formula, R ⁴ , R ⁵ and R ⁶ are each an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms.)
A piperazine compound protected with a silyl group represented by the following general formula (3):

(In the formula, R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ and n are the same as described above.)
After obtaining an organoxysilane compound having a piperazinyl group protected by a silyl group represented by the formula (3), the organoxysilane compound of the formula (3) is desilylated, and the following general formula (4)

(In the formula, R ¹ , R ² , R ³ and n are the same as described above.)
The manufacturing method of the organoxysilane compound which has a piperazinyl group shown by these. 2. The organoxysilane compound having a piperazinyl group according to claim 1, wherein R ⁴ , R ⁵ and R ^{6 in the} general formula (2) are an unsubstituted or substituted secondary or tertiary hydrocarbon group having 3 to 20 carbon atoms. Manufacturing method. The following general formula (5)

(In the formula, R ⁷ , R ⁸ and R ⁹ are unsubstituted or substituted secondary or tertiary hydrocarbon groups having 3 to 20 carbon atoms.)
A piperazine compound protected with a silyl group represented by the formula: The piperazine compound protected with a silyl group according to claim 3, wherein R ⁷ , R ⁸ and R ⁹ are all isopropyl groups or all sec-butyl groups.

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