Coupling of two alkynes with a carbon and an oxygen atom on an Ru3 cluster
Journal of Organometallic Chemistry(1993)
摘要
The phosphonio alkylidyne bridged cluster H2Ru3(CO)9(μ3-C·PPh3) (1) reacts with hexyne-3 under increasingly forcing conditions to form successively the products HRu3(CO)8(μ3-C· PPh3)(η-EtC = CHEt) (2), Ru3(CO)7(μ3-C·PPh 3)(μ-EtC=CHEt)2 (3), and Ru3(CO)8(PPh3)(μ3-C5Et3Ac) (4). The constitution of 4 has been elucidated by a crystal structure determination. It contains an open Ru3(CO)8(PPh3) triangle held together by a (1-rutheno, 2,3,4,-triethyl, 5-acetyl) cyclopentadienyl ligand. The formation of this ligand appears to involve the combination of two hexyne-3 molecules with a CCO unit. Of the latter, one C and one O atom are incorporated into the metallocyclopentadienyl ligand while one C atom is expelled as CH4.
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