Intramolecular Carbolithiation of 2,6-Dilithio-1,6-heptadienes: An Experimental and Theoretical Study
作者:Roberto Sanz、José M. Ignacio、Miguel A. Rodríguez、Francisco J. Fañanás、José Barluenga
DOI:10.1002/chem.200601863
日期:2007.6.4
6-heptadiene (14) has been studied experimentally. A series of ab initio molecular-orbital calculations on the course of the reaction were carried out and the results were compared to those for the corresponding intramolecular carbolithiation of an isolated double bond. The Li-C interactions found in the transition state by this theoretical study support a carbolithiation pathway for the cyclization of
2,6-Dilithio-1,6-庚二烯3在锂双键的Et(2)O / N,N,N',N'-四甲基乙二胺(TMEDA)中经历分子内碳环化反应,得到1,2-双(lithiomethyl )环戊烯5.这些二价阴离子与亲电试剂反应,得到许多1,2-双官能化的环戊烯衍生物7-10。实验研究了2,6-二硫代-1,6-庚二烯(3a)与2-lithio-1,6-庚二烯(14)相比的易碳化作用。在反应过程中进行了一系列从头算的分子轨道计算,并将其结果与相应的分子内碳双离键的碳原子化反应进行了比较。这项理论研究在过渡态中发现的Li-C相互作用为2,6-二硫代-1,6-庚二烯的环化反应提供了一个碳石化途径。