Titanocene(II)-promoted reactions of thioacetals with ethylene: selective formation of terminal olefins with one- or two-carbon homologation

Thioacetals are selectively transformed into two types of terminal olefins, one with one-carbon homologation and the other with two-carbon homologation, by treatment with a titanocene(II) species under ethylene. The mode of the reaction is controlled by changing the ligands coordinated to titanocene(II).