Abstract
The reaction of the η2(4e)-bonded alkyne complexes [ReBr2(η2-RC2Ph)(η-C5H5)](R = Me or Ph) with o-diphenylphosphinostyrene and 2 equiv. AgBF4 in THF surprisingly affords HBF4, AgBr and excellent yields of the cationic η4(5e)-butadienyl complexes [ReC(Ph)-η3-{C(R)CHCHC6H4PPh2-o}(η-C5H5)][BF4]; the methyl-substituted system being structurally characterised by a single-crystal X-ray diffraction study.
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