Process for the simultaneous preparation of 2,5-dioxo-1,2-oxa-phospholanes and .beta.-halogenpropionic acid halide
US4096182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1977 |
| Grant date | Jun 20, 1978 |
| Priority date | — |
| Expiry date | Mar 16, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/3211
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
2,5-Dioxo-1,2-oxa-phospholanes of the formula (I) ##STR1## wherein R.sup.1 is an organic radical and R.sup.2 and R.sup.3 each also represents an organic radical or hydrogen, are prepared by reacting 2-haloformylethyl-phosphinic acid halides of the formula (II) ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are defined as in formula (I) and X means Cl or Br, preferably Cl, with an approximatey equimolar quantity of acrylic acid. The compounds (II) may also be produced in the reaction batch and in situ by reacting about equimolar quantities of a dihalophosphine of the formula (III) ##STR3## with an .alpha.,.beta.-unsaturated acid (IV) EQU R.sup.4 -- OH (IV) In the formulae (III) and (IV) R.sup.1, R.sup.2, R.sup.3 and X are defined as indicated above. In the reaction there is formed, in addition to the compounds (I), practically exclusively .beta.-halopropionic acid and no free hydrogen halide. The phospholanes (I) are valuable flame retarding agents for plastics, intermediates, for example, for the synthesis of biocidals etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.