Process for the preparation of bisphenols

Details Process for the preparation of bisphenols Process for the preparation of bisphenols

C - Chemistry, Metallurgy

07

C

260/617

C07C 31/18 (2006.01) C07C 37/18 (2006.01) C07C 39/12 (2006.01) C07C 39/15 (2006.01) C07C 39/16 (2006.01)

Patent

CA 2035081

74069-l0 ABSTRACT PROCESS FOR THE PREPARATION OF BISPHENOLS The invention is a process for the preparation of triaromatic bisphenols 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 percent 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, trihalotoluenes, and dihalocyanotoluenes. 37,133A-F

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