75522-30-4Relevant academic research and scientific papers
Synthesis of alkyne complexes of the type Ta(η5-C5Me5) (alkyne)Cl2 and crystal structure of Ta(η5-C5Me5)(PhC≡CPh)Cl2
Smith, Gary,Schrock, Richard R.,Churchill, Melvyn Rowen,Youngs, Wiley J.
, p. 387 - 393 (2008/10/08)
Ta(η5-C5Me5)(olefin)Cl2 complexes (olefin = styrene or cyclooctene) react with alkynes (PhC≡CPh, PhC≡CH, 2-butyne, 3-hexyne, HC≡CH) to give analogous Ta(η5-C5Me5)(alkyne)Cl2 complexes which do not react with additional alkyne, CO, HCl, or ethylene with one exception; Ta(η5-C5Me5)(HC≡CH)Cl2 reacts with ethylene at 80°C to give (η5-C5Me5)Cl2TaCH=CHCH 2CH2 irreversibly. The diphenylacetylene ligand in Ta(η5-C5Me5)(PhC≡CPh)Cl2 is bonded parallel to the η5-C5Me5 ring with a long acetylenic linkage (1.337 (8) A?) and short Ta-C(alkyne) bonds (2.067 (6) A and 2.075 (6) A?), consistent with it being a 4-electron donor. The lack of reactivity of these alkyne complexes is postulated to be due to this strong metal-alkyne bond.
