GB359318A - An improved process for producing diarylguanidines - Google Patents
An improved process for producing diarylguanidinesInfo
- Publication number
- GB359318A GB359318A GB628/31A GB62831A GB359318A GB 359318 A GB359318 A GB 359318A GB 628/31 A GB628/31 A GB 628/31A GB 62831 A GB62831 A GB 62831A GB 359318 A GB359318 A GB 359318A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lead
- sulphate
- chloride
- regenerated
- treated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C277/00—Preparation of guanidine or its derivatives, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups
- C07C277/08—Preparation of guanidine or its derivatives, i.e. compounds containing the group, the singly-bound nitrogen atoms not being part of nitro or nitroso groups of substituted guanidines
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
In the process of the parent Specification for the manufacture of symmetrical diarylguanidines by the action of ammonia under pressure on diarylthioureas suspended in benzene, toluene, xylene or other organic solvents, the metallic oxides employed as desulphurizing agents are replaced by lead salts, particularly lead chloride and lead sulphate, with or without the addition of sodium carbonate. The lead salts may be regenerated from the lead sulphide formed in the reaction by treating it with hydrochloric or nitric acid. In the latter case, in addition to lead sulphate, a certain amount of lead nitrate is formed and under the conditions of the reaction is converted into lead oxide, the mixture of oxide and sulphate so formed being suitable for re-utilization. In examples: (1) thiocarbanilide suspended in benzene is treated with ammonia under 5 atmospheres pressure in the presence of a mixture of fresh or regenerated lead chloride and sodium carbonate, producing diphenylguanidine; (2) fresh or regenerated lead sulphate is employed as desulphurizing agent in the process of (1); (3) a mixture of lead chloride and sulphide from the desulphurization is treated with hydrochloric acid to regenerate lead chloride; (4) lead sulphide from the desulphurization with lead sulphate is treated with nitric acid to regenerate lead sulphate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE359318X | 1930-11-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB359318A true GB359318A (en) | 1931-10-22 |
Family
ID=6291144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB628/31A Expired GB359318A (en) | 1930-11-27 | 1931-01-07 | An improved process for producing diarylguanidines |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB359318A (en) |
-
1931
- 1931-01-07 GB GB628/31A patent/GB359318A/en not_active Expired
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