peri-Interaction between diarylmethyl and diarylmethylium units in 1,8-disubstituted naphthalenes: preference of localized structure for the C–H bridged carbocation
作者:Hidetoshi Kawai、Takayuki Nagasu、Takashi Takeda、Kenshu Fujiwara、Takashi Tsuji、Masakazu Ohkita、Jun-ichi Nishida、Takanori Suzuki
DOI:10.1016/j.tetlet.2004.04.002
日期:2004.5
(8-Diarylmethyl-1-naphthyl)bis(4-dimethylaminophenyl)methyliums (aryl=C6H5, 4-IC6H4, and 4-MeOC6H4) were generated by hydride shift from (4-dimethylaminophenyl)methyl group to the diarylmethylium unit at peri-positions of naphthalene. Successful isolation and low-temperature X-ray analysis indicated that they are novel C-H bridged carbocations, which prefer the localized structure with a short contact of C-H... C+ rather than the delocalized one with a three-centered-two-electron bond of (C... H...C)+. (C) 2004 Elsevier Ltd. All rights reserved.
(8-二芳基甲基-1-萘基)双(4-二甲基氨基苯基)亚甲基离子(芳基=C6H5、4-IC6H4和4-MeOC6H4)是通过(4-二甲基氨基苯基)甲基基团的氢向萘环peri位的二芳基甲基离子单元转移生成的。成功地分离并进行了低温X射线分析,结果表明它们是新型的C-H桥连碳正离子,这些碳正离子更倾向于具有C-H... C+短接触的局部结构,而不是具有三中心两电子键(C... H... C)+的非局部结构。版权(2004)属于Elsevier Ltd.,保留所有权利。