formation of the stable inverse Ca(I) sandwich complex [(thf)(3)Ca(mu-C(6)H(3)-1,3,5-Ph(3))Ca(thf)(3)] (1) has been investigated mechanistically by the reaction of bromo-2,4,6-triphenylbenzene with calcium in varying stoichiometric ratios. The key intermediate consists of a solvent-separated ion pair consisting of a dinuclear calcium cation with a bridging doubly deprotonated triphenylbenzene and a triphenylbenzene
形成稳定的逆 Ca(I) 夹心复合物 [(thf)(3)Ca(mu-C(6)H(3)-1,3,5-Ph(3))Ca(thf)(3) ] (1) 已通过
溴-2,4,6-三苯苯与
钙以不同
化学计量比的反应进行机械研究。关键中间体由溶剂分离的离子对组成,该离子对由双核
钙阳离子与桥接双去质子化三苯苯和三苯苯自由基抗衡阴离子 [(thf)(3)Ca(mu-C(6)H(2)-C( 6)H(4)Ph(2))(mu-O-CH=CH(2))Ca(thf)(3)][C(6)H(3)Ph(3)] (4)。形成 1 的前提是重
格氏试剂 [2,4,6-Ph(3)C(6)H(2)}Ca(thf)(3)Br] (2) 的不稳定性,即已经与醚降解反应的作用一起进行了研究。强还原剂1在THF溶液中稳定,不会发生
乙醚裂解。然而,
甲苯以良好的收率
金属化,加入 1,3,5 后生成二苄基
钙络合物 [(tmta)(2)Ca(CH(2)C(6)H(5))(2)]