Formylation of bisphenol-A (la), with subsequent methylation, oxidatio
n and esterification, gave ,2-bis-(4-methoxy-3-methoxycarbonylphenyl)-
propane (11b). It was transformed into 2,2-bis-[4-methoxy-3-(2-hydroxy
-2-propyl)-phenyl] (12b) by the addition of methylmagnesium iodide. Th
is carbinol was condensed with phenol in the presence of dry hydrogen
chloride and the title compound was isolated as its tetramethyl ether
(4b). Its structure of -bis-[4-hydroxy-3-(4-hydroxycumyl)-phenyl]-prop
ane (4a) was confirmed by C-13-NMR spectra.In PhOH/HCI medium tetrakis
phenol (4a) decomposed and isomerized to bisphenol-A (1a).