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Investigations on Novel Tandem Reaction of Three Components, [η5-RC5H4(CO)2Mo]2, Ph2Te2, and Cp2TiCl2, Cp2ZrCl2, or Cp2ZrBr2. Synthesis and Structural Characterization of Tetrakis- and Bis-Bridged Dimolybdenum Complexes (η5-RC5H4Mo)2(μ-PhTe)4 (R = MeCO, MeO2C, EtO2C), (η5-RC5H4Mo)2(μ-Cl)(μ-PhTe)3 (R = MeCO, MeO2C, EtO2C), (η5-RC5H4Mo)2(μ-Br)(μ-PhTe)3 (R = MeO2C, EtO2C), and [η5-RC5H4(CO)2Mo]2(μ-PhTe)2 (R = MeO2C, EtO2C)

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journal contribution
posted on 1999-12-29, 00:00 authored by Li-Cheng Song, Yao-Cheng Shi, Wen-Feng Zhu, Qing-Mei Hu, Xiao-Ying Huang, Fei Du, Xi-An Mao
While reaction of triply bonded dimers [η5-RC5H4(CO)2Mo]2 (R = MeCO, MeO2C) with Ph2Te2 in xylene at 110 °C and subsequent treatment with Cp2TiCl2 at reflux gives novel tetrakis-bridged complexes (η5-RC5H4Mo)2(μ-PhTe)4 (1, R = MeCO; 3, R = MeO2C) and (η5-RC5H4Mo)2(μ-Cl)(μ-PhTe)3 (2a,b, R = MeCO; 4a,b, R = MeO2C), the dimers [η5-RC5H4(CO)2Mo]2 (R = MeO2C, EtO2C) reacted with Ph2Te2 and Cp2ZrCl2 or Cp2ZrBr2 under similar conditions to afford novel tetrakis-bridged complexes (η5-RC5H4Mo)2(μ-PhTe)4 (3, R = MeO2C; 5, R = EtO2C), (η5-RC5H4Mo)2(μ-Cl)(μ-PhTe)3 (4a,b, R = MeO2C; 6a,b, R = EtO2C), and (η5-RC5H4Mo)2(μ-Br)(μ-PhTe)3 (7a,b, R = MeO2C; 8a,b, R = EtO2C). A possible pathway for production of such tetrakis-bridged complexes has been suggested primarily on the basis of the following facts:  (i) Treatment of triply bonded dimers [η5-RC5H4(CO)2Mo]2 (R = MeO2C, EtO2C) with Ph2Te2 in xylene at 110 °C produces bis-bridged complexes [η5-RC5H4(CO)2Mo]2(μ-PhTe)2 (9, R = MeO2C; 10, R = EtO2C) and (ii) reaction of 9 with Cp2MCl2 (M = Ti, Zr) yields tetrakis-bridged complexes 3 and 4a,b. All the new products 110 are fully characterized by elemental analysis and IR, 1H, and 125Te NMR spectroscopies, and 4b and 9 by single-crystal X-ray diffraction techniques.