Abstract Atropisomeric diphenyls (V and VI) are easily prepared by the acid catalysed condensation of 2-methoxycarbonyl-1, 4-benzoquinone and 2-acetyl-1, 4-benzoquinone and trimethyl-1, 4-benzoquinone respectively with 2-isopropyl-5-methylanisole and 2- isopropyl-3, 5dimethylanisole. The reaction is not affected by steric hindrance; the more highly substituted phenols gave better yields. One of the diphenylderivatives has been ...
