REGIOSPECIFIC AND SEQUENTIAL SUBSTITUTION OF TRIMETHYLSILYL-1,6-METHANO[10]ANNULENES VIA THE ELECTROPHILIC ipso-REACTION
作者:Kazuko Takahashi、Keiichi Ohnishi、Kahei Takase
DOI:10.1246/cl.1985.1079
日期:1985.7.5
2-Substituted 7-trimethylsilyl-1,6-methano [10] annulenes have been prepared and their electrophilic ipso-desilyl-substitution has been studied, providing a new route for the regiospecific polyfunctionalization of 1,6-methano[10]annulenes.
Electrophilic substitution in annulenes. Part 4. Transmission of substituent effects in 1,6-methano[10]annulene, determined via protiodesilylation: evidence for substantial C(1)–C(6) transannular orbital interaction
作者:Tsuyoshi Suzuki、Kahei Takase、Kazuko Takahashi、Andrew P. Laws、Roger Taylor
DOI:10.1039/p29880000697
日期:——
2-trimethylsilyl-1,6-methano[10]annulenes have been measured spectrophotometrically at 50 °C using a mixture of aqueous perchloric acid and methanol (2:5 v/v). The substituent effects are greatly reduced as compared with their effects in benzene, the resonance component being adversely affected in particular. This provides further evidence that the structure for 1,6-methano[10]annulene is best described in
使用高氯酸水溶液和甲醇(2:5 v / v)。与它们在苯中的作用相比,取代基的作用大大降低,特别是不利地影响了共振成分。这提供了进一步的证据,以高萘最好地描述了1,6-甲基[10]环戊烯的结构,因为在后者中,共轭作用仅在2位和7位之间微弱地传递。三甲基甲硅烷基取代基在环戊二醇中略微失活,而在苯中则略微活化。通过测量4-三甲基甲硅烷基苯基三乙基锗烷的脯氨酸去甲酸酯化的速率来证实这种活化。p → d)π在基态下,硅的电子吸收更大。