Triphenylethylenes having an N-(dialkylaminoalkyl)alkanesulfonamide substituent in the one of the phenyl rings may be prepared from similarly substituted benzophenones by reaction thereof with a benzyl Grignard reagent followed by dehydration of the resulting triphenylethanol intermediate and if desired chlorination or nitration of the resulting product. The triphenylethylenes have estrogenic and post-coital antifertility action and are useful as intermediates for the preparation of other triphenylethylene compounds.