Abstract
The complex Ru(CO)(CH CHPh)Cl(C 5H 5N)(PPh 3) 2 and related alkenyl complexes react in methanol or ethanol to give ( E, E)-1,4-diphenylbuta-1,3-diene and the ruthenium(II) hydride Ru(CO)H(Cl)-(C 5H 5N)(PPh 3) 3. Further reaction of this hydride with the butadiene results in 1,2-reduction to yield ( E)-1,4-diphenyl-1-butene. However, the reaction of phenylacetylene with catalytic amounts of ruthenium hydrides gave the dimer ( Z)-1,4-diphenylbuten-3-yne. On the other hands, the reaction of 1,2-diphenyl-ethenylruthenium(II) derivatives in methanol or ethanol gave trans-stilbene rather than the butadiene. Several deuteriation experiments were performed in order to elucidate the mechanism of formation of ( E, E)-1,4-diphenylbuta-1,3-diene and ruthenium hydride from the corresponding alkenyl complexes.
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