作者:Brett M. Showalter、John P. Toscano
DOI:10.1002/poc.789
日期:2004.9
with previous low-temperature matrix experiments. Spectral TRIR data confirms that the structure of α-lactones is dependent both on substituents at the α-carbon and on solvent polarity, with electron-donating substituents and polar solvents favoring a zwitterionic ring-opened structure as opposed to the three-membered ring oxiranone form. B3LYP calculations using self-consistent reaction field (SCRF)
苯基氯卡宾,4-硝基苯基氯卡宾,二苯基卡宾,双(4-硝基苯基)卡宾和双(4-甲氧基苯基)卡宾与二氧化碳的反应生成了一系列α-内酯,并通过纳秒时间分辨红外(TRIR)光谱进行了检查。这些羧甲基与二氧化碳反应的估计二级速率常数表明,与先前的低温基质实验一致,更多的亲核羧甲基以更快的速率反应。光谱TRIR数据证实,α-内酯的结构既依赖于α-碳上的取代基,也依赖于溶剂极性,与三元环环氧乙烷酮相反,给电子的取代基和极性溶剂有利于两性离子开环结构形式。使用自洽反应场(SCRF)方法进行的B3LYP计算也为这些实验研究提供了支持。版权所有©2004 John Wiley&Sons,Ltd.