Five‐ and Six‐Membered Cobaltocycles with C,P‐Chelating Ligands through Regiospecific Cyclometalation of Mono(2‐Substituted) Triphenylphosphane
作者:Hans‐Friedrich Klein、Robert Beck、Ulrich Flörke、Hans‐Jürgen Haupt
DOI:10.1002/ejic.200390179
日期:2003.4
P)}tris(trimethylphosphane)cobalt] (4). The molecular structure shows a trigonal-bipyramidal configuration of the cobalt atom accommodating a six-membered metallacycle. 2-(Diphenylphosphanyl)styrene replaces two trimethylphosphane ligands to give [2-(diphenylphosphanyl)styrene-(C,C-η2,P)}methylbis(trimethylphosphane)cobalt] (5), avoiding metalation. Replacement of equatorial trimethylphosphane in compounds
[CoCH3(PMe3)4]与5-(二苯基膦酰基)-1,2,3,4-四氢萘反应生成[8-(二苯基膦酰基)-1,2,3,4 -tetrahydronaphthyl-(C1,P)}tris(trimethylphosphane)cobalt] (1),包含一个五元金属环,如分子结构所示。1-(二苯基膦基)萘相应地反应,得到[8-(二苯基膦基)萘基-(C1,P)}三(三甲基膦)钴](2),2-(二苯基膦基)联苯产生邻位金属化的[2- (二苯基膦基)-3-苯基苯基-(C1,P)}三(三甲基膦)钴] (3),包含一个四元金属环。1-(二苯基膦基)-8-甲基萘在脂肪族取代基中被金属化以形成[[8-(二苯基膦基)萘-1-基]甲基-(C,P)}三(三甲基膦)钴] (4)。分子结构显示了容纳六元金属环的钴原子的三角-双锥体构型。2-(二苯基膦基)苯乙烯取代两个三甲基膦配体得到[2-(二苯基膦基)苯乙烯-(C