Inner-Phase Reaction Dynamics: The Influence of Hemicarcerand Polarizability and Shape on the Potential Energy Surface of an Inner-Phase Reaction
作者:Sigifredo Sánchez Carrera、Jean-Luc Kerdelhué、Kevin J. Langenwalter、Neil Brown、Ralf Warmuth
DOI:10.1002/ejoc.200400578
日期:2005.6
absorption spectra. From the red shifts and from plots of the n-π*-excitation energy of the free diazirines against the solvent polarizability P, the inner-phase polarizability was estimated. P ranges from 0.39 to 0.58 and is larger than the polarizabilities of common organic solvents. A comparison of the activation parameters ΔH , TΔS , and ΔG for the diazirine decomposition in the inner phase with those in
六种苯基二氮丙啶 (2) hemicarceplexes 的热分解和这些 hemicarceplexes 的光谱特性,以及一种螺[环丁苯-1(2H),3'-二氮丙啶] (1) 和一种 p-tolyldiazirine (3) hemicarceplex , 已被研究以确定 hemicarcerand 对内相反应的势能表面的影响。这些半纤维素复合物具有戊基或苯乙基脚基团、三个四亚甲基连接基团,并且一个连接基团X的性质不同如下:1:X=(CH 2 ) 5 ;2: X = (CH 2 ) n (n = 2, 3, 4), (S,S)-CH 2 CH[OC(CH 3 ) O]CHCH 2 和邻-CH 2 C 6 H 4 CH 2 ;3:X = (CH 2 ) 4 。通过MM2力场计算分析了连接基团X对苯基二氮丙啶半复合物结构的影响,并导致内相弯曲的变化,其增加顺序为 (S,S)-CH 2 CH[OC(CH