Novel Ruthenium Complex-Catalyzed Dimerization of 2,5-Norbornadiene to Pentacyclo[6.6.0.0<sup>2,6</sup>.0<sup>3,13</sup>.0<sup>10,14</sup>]tetradeca-4,11-diene Involving Carbon−Carbon Bond Cleavage
作者:Take-aki Mitsudo、Toshiaki Suzuki、Shi-Wei Zhang、Daisuke Imai、Ken-ichi Fujita、Takao Manabe、Masashi Shiotsuki、Yoshihisa Watanabe、Kenji Wada、Teruyuki Kondo
DOI:10.1021/ja9835741
日期:1999.3.1
Bicyclo[2.2.1]hepta-2,5-diene (2,5-norbornadiene) dimerizes in the presence of a catalytic amount of Ru(1-2:5-6-η-cyclooctadiene)(1-6-η-cyclooctatriene) (Ru(cod)(cot)) and an electron-deficient olefin such as N,N-dimethylacrylamide, dimethyl fumarate, or dimethyl maleate in toluene or tetrahydrofuran (THF) to give a new compound, pentacyclo[6.6.0.02,6.03,13.010,14]tetradeca-4,11-diene (PCTD), in high
双环[2.2.1]庚-2,5-二烯(2,5-降冰片二烯)在催化量的Ru(1-2:5-6-η-环辛二烯)(1-6-η-环辛三烯) (Ru(cod)(cot)) 和缺电子烯烃如 N,N-二甲基丙烯酰胺、富马酸二甲酯或马来酸二甲酯在甲苯或四氢呋喃 (THF) 中生成新化合物五环 [6.6.0.02, 6.03,13.010,14]十四-4,11-二烯(PCTD),高产率以及少量已知的内-内二聚体,七环[6.6.0.02,6.03,13.04,11.05,9.010,14]十四烷(HCTD),它是 DMSO 反应的主要产物。Ru(cod)(cot)-富马酸二甲酯在THF中是最有效的催化剂,即使在40℃下PCTD的产率为96%。PCTD 的结构是通过其衍生物 [AgOTf(PCTD)]n 的 X 射线分析确定的。发现PCTD是通过2的内-内二聚化衍生的,5-降冰片二烯。由两个 2,5-降冰片二烯分子形成