Synthesis and structure of 1-metallacyclopent-3-yne complexes of group 4 metals |
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Authors: | Noriyuki Suzuki Takaaki Watanabe Masakazu Iwasaki Meguru Tezuka Daisuke Hashizume |
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Affiliation: | a RIKEN, Wako, Saitama 351-0198, Japan b Department of Applied Chemistry, Faculty of Engineering, Saitama Institute of Technology, Okabe, Saitama 369-0293, Japan c Department of Applied Chemistry, Faculty of Engineering, Saitama University, Sakura-ku, Saitama City, Saitama 338-8570, Japan |
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Abstract: | Five-membered metallacyclic alkyne complexes of titanium and hafnium, 1,1-bis(cyclopentadienyl)-1-titanacyclopent-3-yne (2) and trans-1,1-bis(cyclopentadienyl)-2,5-trimethylsilyl-1-hafnacyclopent-3-yne (6), were synthesized and structurally characterized. The structural analysis of titanium complex 2 implied a larger contribution of an η4-π,π-coordinated structure. The hafnium compound 6 has a similar structure to the corresponding zirconium analogue (1a), although slight differences in the bond lengths and angles were observed. A novel 1-zirconacyclopent-3-yne complex, 1,1-bis(methylcyclopentadienyl)-2,5-bis(trimethylsilyl)-1-zirconacyclopent-3-yne (5), was also prepared and the structure of the trans-isomer was determined. |
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Keywords: | Titanium Hafnium Zirconium Metallacyclopentyne Butatriene |
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