(Acetonitrile)[4-tert-butyl-2-(diisopropylphosphino)-1-methyl-1H-imidazole-κN,κP](η5-cyclopentadienyl)ruthenium(1+) hexafluorophosphate, is an Alkene Zipper Catalyst, used in selective transformation of a large variety of ω-alkenyl cyclopropylcarbinols into stereodefined unconjugated (E)-acyclic aldehydes .