Mt. Kuo et al., STOICHIOMETRIC ALKYNE METATHESIS AT METAL CLUSTER COMPOUNDS - INTERCONVERSION OF OS3W ALKYNE ALKYLIDYNE AND DIMETALLOALLYL CLUSTERS, Organometallics, 13(6), 1994, pp. 2142-2144
Treatment of Os3(CO)10(C2Me2) with CpW-(CO)2(=CTol) produced the alkyl
idyne-alkyne cluster CpWOs3(CO)10(mu3-CMe)(CMeCTol) (2) and the dimeta
lloallyl complex CpWOs3(CO)9[C(Me)C(Me)C(Tol)] (3) in sequence. Thermo
lysis of 3 induced the selective scission of one C-C bond to give a se
cond alkylidyne-alkyne cluster, CpWOs3(CO)8(mu3-CTol)(C2Me2) (4), prov
iding a model of alkyne metathesis through a dimetalloallyl intermedia
te.