Homogeneous Catalytic Dimerization of Terminal Alkynes by C5Me5Ru(L)H3 (L = PPh3, PCy3, PMe3)
Organometallics1996Vol. 15(19), pp. 3968–3971
Citations Over TimeTop 1% of 1996 papers
Abstract
The ruthenium hydride complexes C5Me5Ru(L)H3 (L = PPh3 (1a), PCy3 (1b), PMe3 (1c)) were found to catalyze the dimerization reaction of terminal alkynes RC⋮CH (R = Ph, t-Bu, SiMe3, CH2Ph, C4H9) to produce cis- and trans-1,4-disubstituted enynes RCHCHC⋮CR and 1,3-disubstituted enynes CH2C(R)C⋮CR. The selective product formation was effected by modulating both the catalyst environment and the alkyne substrates. A rare form of dimer, cumulene PhCH2CHCCCHCH2Ph (5d), was cleanly obtained from the dimerization of HC⋮CCH2Ph with 1b. A mechanistic interpretation is presented on the basis of the product distribution.
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