Szwzwzavy. :itropisomcric diphenpls ( V and V1) :ire easily prepared by the acid catalysetl condensation of 2-mct~ioxycarbonyl-1, 4benzoquinonc a n d 2-acetyl-l14-bcnzoquinone and trimet~iyl-l,4-bcnzoquinoi-te respcctivelp with 2-isopropyl-5-meth).lanisolc and 2-isopropyl-3,5-dinicthylanisolc. The reaction is not affected by steric hindrance; the more highly suhstitutcd phenols gave better yields. One of the c!iphenyldcrivatives has been resolved with help of dehydroabictylaminc. Thermodynamic d a t a for the racemisation process Ilavc been tletcrniined by classical polarimetric techniques (Table 4 ) . The chirality of most of thc compounds prepared is easily detected b>-considering the signals of the diastcreotopic isopropyl group in the KMR.