Process for the preparation of O,O-dialkyl-S-benzyl thiophosphates
US4064200A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1976 |
| Grant date | Dec 20, 1977 |
| Priority date | — |
| Expiry date | Jan 13, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/1653
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
O,O-Dialkyl-S-benzyl thiophosphates are obtained by reacting a diester of phosphorous acid such as dimethyl phosphite or diethyl phosphite, in an organic solvent such as toluene or xylene which is sparingly soluble or insoluble in water, with sulfur and an alkali or alkaline earth metal hydroxide or oxide such as NaOH or Ca(OH).sub.2, extracting the reaction product with water and then reacting the extract with a benzyl halide. In this manner, O,O-dialkyl-S-benzyl thiophosphates useful as agricultural and horticultural bactericidal and insecticidal agents are industrially advantageously obtained in a high purity and in a high yield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.