Process for the preparation of hydroxybenzylphosphonates
US5157141A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1990 |
| Grant date | Oct 20, 1992 |
| Priority date | — |
| Expiry date | Nov 21, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/4056
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of compounds of the general formula I ##STR1## in which R.sub.1 is hydrogen or methyl, R.sub.2 and R.sub.3 independently of one another are C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.8 cycloalkyl, phenyl, C.sub.7 -C.sub.9 phenylalkyl or halogen, R.sub.2 is additionally hydrogen and R.sub.7 and R.sub.8 independently of one another are C.sub.1 -C.sub.18 alkyl, phenyl or C.sub.7 -C.sub.18 alkylphenyl, which comprises reacting a phenol of the formula II ##STR2## in which R.sub.1 to R.sub.3 have the meaning described above, with formaldehyde or paraformaldehyde, an amine of the formula III EQU NR.sub.4 R.sub.5 R.sub.6 III in which R.sub.4 is C.sub.1 -C.sub.4 alkyl and R.sub.5 and R.sub.6 independently of one another are hydrogen or C.sub.1 -C.sub.4 alkyl, and a phosphite of the formula IV ##STR3## in which R.sub.7 and R.sub.8 have the meaning described above and R.sub.9 has the meaning given for R.sub.7 and R.sub.8, at a temperature of 0.degree.-200.degree. C. Some compounds of the formula I are novel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.