Process for making polyphenols from ketones or aldehydes and phenols
US5463140A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1994 |
| Grant date | Oct 31, 1995 |
| Priority date | — |
| Expiry date | Aug 31, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2603/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the condensation of an aldehyde or ketone starting material with a phenol, unsubstituted in the 4-position, comprises reacting the aldehyde or ketone starting material with the phenol in a reaction mixture in the presence of a soluble or insoluble mercaptosulfonic acid compound under conditions sufficient to bring about formation of a geminal bisphenolic moiety at each aldehyde or ketone moiety in the starting material. A miscible mercaptosulfonic acid compound is characterized by the formula EQU (HS).sub.a -.theta.-(SO.sub.3 H).sub.b or a precursor thereof, wherein .theta. is an alkylene, cycloaliphatic, arylene, alkylenearylene, alkylenecycloaliphatic, alkylenearyl, heterocyclic or alkyleneheterocyclic residue. Heterogeneous catalysts comprise insoluble materials comprising catalytically-active species represented by the formula: ##STR1## L is an optional linking group and -- is a bond, which catalytically-active species is attached by the bond -- to an insoluble organic or inorganic support; or a catalytically-active species represented by the formula: ##STR2## wherein L' is an optional linking group, -- is a bond and .theta.' and .theta." are residues of .theta., …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.