Catalytic synthesis of 3-vinyl-2,5-dihydrofurans from yne-enes promoted by photochemically activated metal–allenylidene LnRu
C
C
CR2 complex
Abstract
The ruthenium(II)–allenylidene salt [(p-cymene)(PCy3)ClRuC
C
CPh2]PF6 acts as an olefin metathesis catalyst precursor for the yne-ene transformation of the mixed propargylic allyl ethers HC
C–CR2OCH2CH
CH2 into 3-vinyl-2,5-dihydrofurans; initial photochemical irradiation efficiently promotes the catalytic activity.