Spectroscopic characterization of 1-methylene-2-vinylcyclopropane and some of its derivatives
作者:A. M. Brouwer、H. J. C. Jacobs
DOI:10.1002/recl.19871060203
日期:——
show coupling patterns among the methylene and ring protons that are essentially independent of the substituents. The coupling constant between H-2 and the α-proton of the substituent depends on the conformation. 13C chemical shifts and coupling constants are readily interpreted using common substituent effect rules. MNDO calculations provide proton-proton distances and bond orders which are used to
描述和讨论了1-亚甲基-2-乙烯基环丙烷1及其一些衍生物的特征NMR和振动光谱性质。持续地在1745cm -1处发现了外循环CC拉伸振动。的1 1 H NMR谱表明,基本上独立于所述取代基的亚甲基和环质子间偶合图案。H-2和取代基的α-质子之间的偶合常数取决于构象。使用常见的取代基效应规则可轻松解释13 C化学位移和偶联常数。MNDO计算提供了质子-质子距离和键序,用于解释质子弛豫率和质子-质子耦合常数。