Lithium 5-(2-diphenylphosphinoethyl)-1,2,3,4-tetramethylcyclopentadienide: Regioselectivity of alkylation of the tetramethylcyclopentadienide anion
作者:D. P. Krut'ko、M. V. Borzov、E. N. Veksler、E. M. Myshakin、D. A. Lemenovskii
DOI:10.1007/bf02498168
日期:1998.5
Treatment of a mixture of isomeric (2-chloroethyl)-1,2,3,4-tetramethylcyclopentadienes with lithium diphenylphosphide leads to novel 4,5,6,7-tetramethylspiro[2,4]hepta-4,6-diene among the reaction products. The reaction of spiroheptadiene obtained with excess LiPPh2 at elevated temperature affords lithium 5-(2-diphenylphosphinoethyl)-1,2,3,4-tetramethylcyclopentadienide in almost quantitative yield
用二苯基磷化锂处理异构 (2-氯乙基)-1,2,3,4-四甲基环戊二烯的混合物,可得到新型 4,5,6,7-四甲基螺[2,4]庚-4,6-二烯。反应产物。在升高的温度下获得的螺庚二烯与过量的 LiPPh2 反应以几乎定量的产率提供 5-(2-二苯基膦基乙基)-1,2,3,4-四甲基环戊二烯锂。四甲基环戊二烯阴离子烷基化的区域选择性通过从头开始对 C5Mc4H- 进行的量子化学计算进行估计。环碳原子上的全部电荷是在巴德分子中原子碎片理论的框架内确定的。