Crystalline alkyl-lithiums from α-trimethylsilyl-substituted o-xylenes; X-ray crystal structure of [{o-C6H4(CHSiMe3)2}{Li(tmeda)}2](tmedaMe2NCH2CH2NMe2)
摘要:
[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。
Crystalline alkyl-lithiums from α-trimethylsilyl-substituted o-xylenes; X-ray crystal structure of [{o-C6H4(CHSiMe3)2}{Li(tmeda)}2](tmedaMe2NCH2CH2NMe2)
摘要:
[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。
Metalation of mesitylene with butyllithium in hexane in the presence of tetramethylethylenediamine yields mono-, di- and trilithiated benzylic compounds (1–5), characterized as their silylated derivatives. Dilithiation occurred partly at the same but preferentially at different methyls. The symmetrical tris-1,3,5-(lithiomethylene)benzene was the main product. Similar metalation occurred with m-xylene