cycloaddition with dimethyl maleate proceeds with retention of configuration. Benzonorbornadiene also enters into the 2+2 reaction, while endo-tricyclo[3.2.1.02,4]oct-6-ene, bicyclo[2.2.1]heptene, and 5-methylenebicyclo[2.2.1]heptene are unreactive. Origins of the observed selectivities in the catalyzed reaction are discussed.
在双(
丙烯腈)
镍(0)或双(
1,5-环辛二烯)
镍(0)存在下,外
三环[3.2.1.02,4]oct-6-烯环加成到
丙烯腈和
丙烯酸甲酯中,得到抗-和syn-3-cyano-exo,exo-四环[4.3.1.02,5.07,9]
癸烷或相应的甲氧基羰基衍
生物。与
马来酸二甲酯的环加成保持构型。苯并降
冰片二烯也进入2+2反应,而内
三环[3.2.1.02,4]oct-6-烯、双环[2.2.1]庚烯和5-亚甲基双环[2.2.1]庚烯不反应。讨论了催化反应中观察到的选择性的起源。