Ti-Catalyzed Selective Isomerization of Terminal Mono-substituted Olefins

Transition metal complexes have been utilized in the homogeneous catalysis because of selectivity and catalytic activity under mild conditions.1 The isomerization of olefins catalyzed by transition metal complexes constitutes one of important type of reaction in organometallic chemistry.2 The isomerization of olefins occurs either by a metal hydride addition-elimination or by a π-allyl metal hydride inter-mediate.2b HCo(CO)4, [(C2H4)2RhCl]2, Ni[P(OEt)3]4, and PtCl2(PPh3)2-SnCl2 are effective catalysts for isomerization of olefins via a metal hydride addition-elimination mechan-ism,3,4 and Fe3(CO)12 catalyzed isomerization of 3-ethyl-1-pentene and isomerization of 1-heptene catalyzed by (PhCN)2PdCl2 occur via a π-allyl metal hydride mech-anism.4,5 The cis/trans ratio of 2-butene obtained from isomerization of 1-butene by RhH(CO)(PPh3)3 has also bee