Twisting the arm: structural constraints in bicyclic expanded-ring N-heterocyclic carbenes.

Twisting the arm: structural constraints in bicyclic expanded-ring N-heterocyclic carbenes.
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扭转手臂:双环扩环N-杂环卡宾的结构约束。

DOI:
10.1039/c8dt04462g
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发表时间:
2019
期刊:
2003)
影响因子:
--
通讯作者:
Sampford KR
Sampford KR
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--
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作者:
Sampford KR

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制备了一系列二芳基、单芳基/烷基和二烷基单环和双环扩展环n杂环碳化合物(ER-NHCs),并通过对15个Au(NHC)X和/或[Au(NHC)2]X配合物的结构分析,研究了它们与Au(I)的络合作用。取代的二芳基7-NHCs具有最大的空间负担,埋体积(%VB)值为40-50%,而较不灵活的六元类似物的%VB值至少小5%。虽然含有6元环和7元环(6,7- nhcs)的双环体系受到相对尖锐的NCN键角的约束,但它们在本文报道的二烷基衍生物中具有最大的%VB值,这一特征与杂环的固定构象和预设甲基取代基的压缩效应有关。
A series of diaryl, mono-aryl/alkyl and dialkyl mono- and bicyclic expanded-ring N-heterocyclic carbenes (ER-NHCs) have been prepared and their complexation to Au(I) investigated through the structural analysis of fifteen Au(NHC)X and/or [Au(NHC)2]X complexes. The substituted diaryl 7-NHCs are the most sterically encumbered with large buried volume (%VB) values of 40–50% with the less flexible six-membered analogues having %VB values at least 5% smaller. Although the bicyclic systems containing fused 6- and 7-membered rings (6,7-NHCs) are constrained with relatively acute NCN bond angles, they have the largest %VB values of the dialkyl derivatives reported here, a feature related to the fixed conformation of the heterocyclic rings and the compressional effect of a pre-set methyl substituent.
包含扩展的 N-杂环卡宾和双环樟脑骨架的 Grubbs-Hoveyda II 配合物的反应性
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