Process for producing 1,3-bis(dicarboxyphenyl)-disiloxane derivative or dianhydride thereof
US5166363A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1991 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Dec 9, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F7/0889
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for producing (i) a 1,3-bis(dicarboxyphenyl)disiloxane derivative represented by the general formula ##STR1## wherein Rs and R's independently of one another denote methyl or phenyl or (ii) a 1,3-bis(dicarboxyphenyl)-disiloxane derivative dianhydride represented by the general formula ##STR2## wherein Rs and R's are as defined above, the process comprising coupling a Grignard reagent of halo-o-xylene with a disubstituted halosilane represented by the general formula ##STR3## wherein R and R' are as defined above and X denotes halogen, to form a dimethylphenyl(disubstituted silane) represented by the general formula ##STR4## wherein R and R' are as defined above, hydroxylating the dimethylphenyl(disubstituted silane) to form a dimethylphenyl(disubstituted hydroxysilane) represented by the general formula ##STR5## wherein R and R' are as defined above, to form a 1,3-bis(dimethylphenyl)-disilane PA1 dehydrating-condensing the dimethylphenyl-(disubstituted hydroxysilane derivative represented by the general formula ##STR6## wherein Rs and R's are as defined above, and oxidizing the 1,3-bis(dimethylphenyl)disilane derivative to yield the intended 1,3-bis(dicarboxyphenyl)disilo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.