binuclear zirconocene complex [Cp2-Zr(μ-CHCHC2H5)(μ-CH2PPh2)ZrCp2] 2. Complex 1 reacts with butadiene to give 2 and Ph2PCH3. At 80°C complex 2 catalyzes the chemoselective hydrogenation of 1,3-cyclooctadiene to cyclooctene. Formation of a binuclear μ-alkenyl zirconium(IV)/zirconium(II) intermediate, similar to 2, is proposed to explain the effective protection of the remaininig CC double bond in the catalytic
                                    低聚氢基
锆络合物的[Cp 2 Zr的(H)(CH 2 PPH 2)] Ñ(1)反应以(η 4 -
丁二烯)二茂
锆,得到(μ-1-η 1:1,2-η 2 -
丁烯基),(μ-phosphinomethylene)双桥联的双核络合物茂
锆的[Cp 2 -Zr(μ-CHCHC 2 ħ 5)(μ-CH 2 PPH 2)ZrCp 2 ] 2。配合物1与
丁二烯反应生成2和Ph 2 PCH 3。在80°C时2催化1,3-
环辛二烯化学选择性加氢成环
辛烯。提出了类似于2的双核μ-烯基
锆(IV)/
锆(II)中间体的形成,以解释在催化循环中对余下的CC双键的有效保护。