Process for preparing alkyl or aryl thiophosphorus halides and mixed isomers thereof
US4133830A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1977 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Feb 4, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Improved yields and a lower accumulation of by-product is obtained in the method for preparing compounds of the formula: ##STR1## wherein R is a C.sub.1 to C.sub.20 alkyl radical, cycloalkyl of 5-6 carbon atoms in the ring and the C.sub.1 -C.sub.4 alkyl substituted derivative thereof, an aralkyl radical of up to two fused rings, the alkyl portion having from 1 to 20 carbon atoms, an aryl radical of up to three fused rings and the C.sub.1 -C.sub.4 alkyl derivatives thereof, and biphenyl and the C.sub.1 -C.sub.4 alkyl derivatives thereof, X is a halogen of chlorine or bromine, and Z is either R or X, by the reaction of a phosphorus halide source, a hydrocarbon source selected from the group consisting of RH, RX and RSaR, wherein a is 1 or 2 and a sulfur source under autogenous pressure in an autoclave at a temperature ranging from about 175.degree. C. to about 450.degree. C. by recycling to successive runs a by-product of the reaction remaining after separation of the RP(S)XZ product fraction selected from the group consisting of: PA1 (a) a by-product fraction having a boiling point lower than the product fraction; PA1 (b) a by-product fraction having a boiling point higher than the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.