Experimental and Computational Studies of the Structure of Sulfonimidoyl Vinyllithiums
作者:Alexander Walter Giesen、Gerhard Raabe、Jan Runsink、Hans-Joachim Gais
DOI:10.1002/chem.201701881
日期:2017.10.12
of the anionic C atom. tBuCH=C(Li)S(O)(NMe)Ph (2⋅L) is most likely also a monomer with a C−Li bond. According to 6Li,1H} NOE experiments it has a four‐membered C‐Li‐N‐S chelate ring structure. 13C NMR spectroscopy showed the C−Li bonds of 1⋅L and 2⋅L to be fluxional. 1H NMR spectroscopy and 1D TOCSY experiments of Ph2C=C(Li)S(O)(NSO2Tol)Ph revealed topomerization of the phenyl groups, which is attributed
吨布赫= C(Li)的S(O)(NSO 2托尔)PH ⋅ L(L = 2THF,TMEDA)(1⋅ L)的THF溶液与根据NMR光谱和冰点降低测定法一C-Li键的单体。通过标量13 C,6 Li耦合和6 Li 1 H} NOE实验将其鉴定为CIP 。CIP具有六元C-Li-O-S-N-S螯合环结构。6李,1 ħFUCOUP和6栗,1个h的HMQC NMR实验1⋅ TMEDA揭示了标量6栗,1H跨Li-C = C-H键耦合。根据NMR数据,阴离子C原子的负电荷使1⋅L的π键极化。t BuCH = C(Li)S(O)(NMe)Ph(2⋅L)最有可能也是具有C-Li键的单体。根据6 Li, 1 H} NOE实验,它具有四元C-Li-N-S螯合环结构。13 C NMR光谱显示1⋅L和2⋅L的C-Li键具有通量。Ph 2 C = C(Li)S(O)(NSO 2 Tol)的1 H NMR光谱和一