Patent ID: 6414200
Filing Date: 2002-07-02
Classification: C07C

Abstract:
A method for making a bisphenol, said method comprising contacting a mixture comprising a hydroxyaromatic compound and a ketone or an aldehyde with an acidic catalyst at a temperature in a range between about 25Â° C. and about 95Â° C. in the presence of a silylmethanethiol promoter having structure I,wherein R1 and R2 are each independently hydrogen, a C1-C40 aliphatic radical, a C3-C40aromatic radical, a C3-C40 cycloaliphatic radical, orR1 and R2 together form a C3-C40cycloaliphatic radical or a C4-C40aromatic radical; R3-R1 are each independently a C1-C40aliphatic radical, a C3-C40aromatic radical, or a C3-C40cycloaliphatic radical; or any two of the groups R3-R1 together form a C5-C40cycloaliphatic radical or C5-C40aromatic radical; or the groups R3-R5 together form a C9-C40cycloaliphatic radical or C10-C40aromatic radical.