Catalytic synthesis of 3-vinyl-2,5-dihydrofurans from yne-enes promoted by photochemically activated metal–allenylidene LnRuCCCR2 complex

Abstract

The ruthenium(II)–allenylidene salt [(p-cymene)(PCy₃)ClRuCCCPh₂]PF₆ acts as an olefin metathesis catalyst precursor for the yne-ene transformation of the mixed propargylic allyl ethers HCC–CR₂OCH₂CHCH₂ into 3-vinyl-2,5-dihydrofurans; initial photochemical irradiation efficiently promotes the catalytic activity.