The solution structures of two allenyl-propargyllithium reagents (6-Li and 7-Li) which give (13)C NMR chemical shifts intermediate between those expected for the allenyl and propargyl isomers have been studied by the Saunders isotope perturbation technique. Variable equilibrium isotope shifts were detected, showing that these reagents adopt structures ranging from equilibrating localized allenyl- and
已经通过桑德斯同位素扰动技术研究了两种在(13)C NMR
化学位移介于中间值的烯丙基和炔丙基异构体之间的烯丙基-炔
丙基锂试剂(6-Li和7-Li)的溶液结构。检测到可变的平衡同位素位移,表明这些试剂采用的结构范围从平衡局部的烯丙基和炔
丙基锂试剂(1A右鱼叉超过左鱼叉1B)到平衡非对称桥结构(11)和对称桥结构(2),主要取决于溶剂化的细节。