Crystalline alkyl-lithiums from α-trimethylsilyl-substituted o-xylenes; X-ray crystal structure of [{o-C<sub>6</sub>H<sub>4</sub>(CHSiMe<sub>3</sub>)<sub>2</sub>}{Li(tmeda)}<sub>2</sub>](tmedaMe<sub>2</sub>NCH<sub>2</sub>CH<sub>2</sub>NMe<sub>2</sub>)
作者:Michael F. Lappert、Colin L. Raston、Brian W. Skelton、Allan H. White
DOI:10.1039/c39820000014
日期:——
Reaction of [o-C6H4(CHRRâ²)(CHRâ³Râ´)](R,Râ²,Râ³,Râ´H or SiMe3) With LiBun in n-hexane in the presence of Me2NCH2CH2NMe2(tmeda) or MeN (CH2CH2NMe2)2(pmdeta) results in selective lithiation of the α-carbon in a manner dependent on the nature of the associated substituents and the tertiary amine to afford novel crystalline lithium alkyls; a single-crystal X-ray structure determination of [o-C6H4(CHSiMe3)2}Li(tmeda)}2] shows each lithium to interact with both the α-and adjacent ring carbon atoms from opposite sides of the o-xylidene plane.
[o-C6H4(CHRR‐2)(CHR‐3R‐‐)](R,R‐‐‐,R‐‐‐‐,R‐‐H 或 SiMe3) 与 LiBun 在正己烷中在 Me2NCH2CH2NMe2(tmeda) 存在下的反应) 或 MeN (CH2CH2NMe2)2(pmdeta) 导致 α-碳选择性锂化,其方式取决于相关取代基和叔胺的性质,以提供新型结晶烷基锂; [o-C6H4(CHSiMe3)2}Li(tmeda)}2] 的单晶 X 射线结构测定显示每个锂与 o 相对侧的 α 环和相邻环碳原子相互作用-二亚甲基平面。