SU126687A1 - The method of obtaining dialkylamino thiophosphates - Google Patents

Description

Thiophosphoric esters are effective agricultural pre-chemicals.

They are usually obtained by the interaction of sodium alcohols or phenols with an alkyl dichlorothiophosphate or by the interaction of alcohols with aryl dichlorothiophosphate in the presence of a tertiary organic base. vania as an acceptor of hydrogen chloride. The disadvantage of these methods is their complexity ....

The described method for the preparation of thiophosphoric acid mixed fatty aromatic esters consists in reacting the aryl dichloro phosphate with the corresponding alcohol, taken in 10 mol or more per 1 mole of aryl dichlorophosphate, depending on the nature of the reagents.

Example 1; In a flask with a reflux condenser and a mechanical stirrer, a mixture of 27.2 g of l-nitrophenyldichlorothiophosphate and 96 f is placed. methyl alcohol and for 5 hours, stirred at 20-30 °. After completion of the reaction, the mixture is diluted with 150-200 ml of water, 0,0-dimethyl-0,4 nitrophenylthiophosphate is separated, washed with a solution of soda and water. after drying, fractionated in vacuo. T. Kip. 157-159 at. 2 mm; Af 1.3519; p 1.5600; m.p.- 36 °. The product yield is about 60% of

theoretical. - -. -.

Example2. Under the conditions of measure 1, 27.2 g of α-nitrophenyl dichloroethyphosphate and 138 g of absolute ethanol were boosted. The yield of thiophos is 60-70% of the theoretical. Example 3. Under the conditions of test 1, 22.5 g of fennidchlorothiophosphate was reacted with 96 g of methyl alcohol. The output of dimethylphenylphosphate 55-60% of theoretical. T. Kip. 95 ° with 0.1 mm. Found P% - 14.20; calculated P% - 14.22.

The method of producing dialklarylthiophosphates. characterized in that the arylnhlortrophosphates are treated with an excess of the corresponding alcohol, in an amount more than tenfold.

Subject invention