Regiospecific Cp★Ru+ mediated codimerization of conjugated dienes with non-conjugated 1,5-dienes and its application to catalytic cooligomerization

Abstract

When Cp★RuCl(η4-butadiene) (1; where Cp★  η5-C5Me5) was treated with an excess of 1,5- hexadiene in the presence of silver trifluoromethanesulfonate (AgOTf) at or below ambient temperature, a 2-(3′-butenyl)- 1,5-hexadiene complex of cationic ruthenium was obtained by regiospecific C4 homologation at the internal carbon atom of the non-conjugated diene. This stoichiometric CC bonding was extended to the catalytic codimerization and stepwise oligomerization of butadiene with 1,5-hexadiene or 1-hexene.