The proportion of 1,2 and homo-1,4 adducts obtained from the reaction of difluoro-carbene with norbornadiene and its 7-oxa, 7-methyl, and 7,7-difluoro derivatives is reflected by the calculated energies of the frontier molecular orbitals of the dienes. It appears that the product composition is dictated by competing 1,2 electrophilic and homo-1,4 nucleophilic cheletropic reactions.
二氟卡宾与降
冰片二烯及其7-氧杂,7-甲基和7,7-二
氟衍
生物的反应获得的1,2和1,4加合物的比例通过前沿分子的计算能量来反映二烯的轨道。看来,产物组成是由竞争的1,2,亲电和均一,1,4亲核的亲核反应决定的。