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The kinetics for isomerization of HRu3(p3-q3-EtSCCMeCMe)(CO), to Ru3(y-SEt)(p3-q3-CCMeCHMe)(CO), were determined. The overall process involves C-H elimination, C S and Ru-Ru bond cleavage and Ru,(p-S) bond formation. Activation parameters were determined from the temperature dependence (AH* = 127(3) W/mol, ASr= 56(11) J/mol-K) and from the pressure dependence (0-207 MPa, A V O +12.7(1 .I) cm3/mol, Ap* = +0.037(0.012) cm3/(mol-MPa)) of the rate constant. The data are consistent with an intramolecular reaction involving significant metalmetal or carbon-sulfur bond cleavage in the transition state. The activation volume is too large to be accommodated by C-H elimination alone and CO dissociation is not involved.

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