Aromatic polyhydroxy compounds and process for the preparation thereof
US5541282A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1994 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | Nov 9, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C39/15
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention involves aromatic polyhydroxy compounds, including triaromatic bisphenols and tris-[1,1,1-(4-hydroxyphenyl)] toluenes, and a process for the preparation thereof by reacting a phenolic compound, e.g. phenol, with a suitable halo-compound, for instance 1,1-dichloroethylbenzene, 1-chlorostyrene, or mixtures thereof. The reaction may be conducted in the presence or absence of a solvent; an excess of the phenolic compound can serve as the solvent. The product is conveniently recovered by removing the by-product HCl, excess phenolic compound, excess solvent and cooling. Yields of bis-1,1-(4-hydroxyphenyl)-1-phenylethane which are greater than 90% of theoretical have been obtained by the reaction of phenol and 1,1-dichloroethylbenzene, and a large portion of the yield is para isomer. Suitable halo-compounds include aromatic dihalo-compounds having at least one aliphatic substituent having two alpha-halogen atoms and at least one beta halogen atom, halo-styrenes having structures corresponding to such aromatic dihalo-compounds except that an alpha-halogen atom and a beta hydrogen atom are removed and there is a double bond between the alpha and beta carbon atoms, trihalotolue…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.