Process for making aryldichlorophosphanes
US4536351A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1983 |
| Grant date | Aug 20, 1985 |
| Priority date | — |
| Expiry date | Dec 15, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The disclosure relates to a process for making aryldichlorophosphanes of the general formula ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 being identical or different each stand for a hydrogen atom, an alkyl group having from 1 to 8 carbon atoms, a halogen atom, an aryl group of an aryloxy group by reacting an arene of the general formula ##STR2## in which R.sub.1, R.sub.2 and R.sub.3 have the meanings given above, with at least 4 mols phosphorus (III) chloride per mol arene in the presence of aluminum chloride, boiling the mixture over a period of several hours and subsequently precipitating the aluminum chloride by adding a complexing agent, filtering and distillatively working up the filtrate. More particularly, the disclosure provides for 0.05 to 0.9 mol aluminum chloride to be used per mol arene and for 1-3 mols finely ground alkali metal chloride to be used as the complexing agent per mol aluminum chloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.