The method of the synthesis of unsaturated aromatic oxiranosilanes by interaction of trialkyl- (aryl)-hydridesilanes with aromatic oxiranes of the acetylene series in the presence of catalyst (platinumhydrochloric acid) in a medium of absolute benzene (yield up to 82-85%) was developed and their properties studied. It was showed that the addition reaction proceeded on a triple bond according to Farmer's rule with the formation of trans-adducts and the maintenance of the oxirane ring. The composition and structure of the obtained unsaturated aromatic oxiranosilanes were confirmed by IR and PMR spectra. It revealed that the obtained unsaturated aromatic oxiranosilanes were highly reactive compounds and can undergo the reaction with nucleophilic and electrophilic reagents