CH3···O Hydrogen Bond. Implications of Its Presence from the Substituent Effects on the Populations of Rotamers in 4-Substituted 9-Ethyl-1-methoxytriptycenes and 9-(Substituted Phenoxymethyl)-1,4-dimethyltriptycenes
Substituent Effects on the Populations of Rotational Isomers in 9-(Aryloxymethyl)-1,4-dimethyltriptycenes. Implications for the Presence of CH3···O Hydrogen Bond
摘要:
通过 1H NMR 光谱测定了 9-(芳氧基甲基)-1,4-二甲基三联苯中的±sc/ap 群比率。取电子取代基有利于 ap 转子,而供电子取代基则相对有利于 ±sc 转子。这些结果归因于±sc形式中存在微弱的CH3--O分子内氢键。