Competitive pathways in the reaction of acetylenic alcohols with the η5-cyclopentadienyl(dicarbonyl)(η2-2-methylpropene)iron(II) cation

Abstract

The reaction of the title iron complex with but-3-yn-1-ol yields a 1 : 1 mixture of the η²-2,3-dihydrofuran complex (2) and the 2-oxacyclopentylidene carbene complex (3) while pent-4-yn-1-ol yields the η²-2-methylenetetrahydrofuran complex (6); η²-acetylene and vinylidene carbene complexes are proposed as intermediates.