95552-64-0Relevant academic research and scientific papers
Reactivity of substituted acetylenes with [(η5-C5H4CH3) 2ZrH(μ-H)]2. Observation of zirconacyclopentadiene formation and acetylene hydrogenation
Jones, S. Bart,Petersen, Jeffrey L.
, p. 966 - 971 (2008/10/08)
The reactivity of [(η5-C5H4CH3) 2ZrH(μ-H)]2 with various substituted acetylenes has been investigated. Diphenylacetylene and phenylacetylene react with [η5-C5H4CH3) 2ZrH(μ-H)]2 below 50°C to yield primarily (η5-C5H4CH3) 2Zr(C4(C6H5)4) and the 2,5-diphenyl-substituted isomer of (η5-C5H4CH3) 2Zr(C4(C6H5)2H 2), respectively. Under appropriate conditions substantial hydrogenation of diphenylacetylene to trans-stilbene and phenylacetylene to ethylbenzene, respectively, is observed. These results suggest that at least two competing processes - zirconacyclopentadiene formation and acetylene hydrogenation - are present. Complementary EPR studies for the reactions of [(η5-C5H4CH3) 2ZrH(μ-H)]2 with diphenylacetylene, 1-phenylpropyne, and 2-butyne have further revealed the formation of a paramagnetic zirconocene species (η5-C5H4CH3) 2Zr(H)(RC≡CR). The possible participation of this adduct in the acetylene chemistry of [(η5-C5H4CH3) 2ZrH(μ-H)]2 is discussed.
