Reaction of Chlorosulfonyl Isocyanate with Fluorosubstituted Alkenes: Evidence of a Concerted Pathway
作者:Dale F. Shellhamer、Kevyn J. Davenport、Danielle M. Hassler、Kelli R. Hickle、Jacob J. Thorpe、David J. Vandenbroek、Victor L. Heasley、Jerry A. Boatz、Arnold L. Reingold、Curtis E. Moore
DOI:10.1021/jo101240s
日期:2010.11.19
Concerted reactions are indicated for the electrophilic addition of chlorosulfonyl isocyanate with monofluoroalkenes. A vinyl fluorine atom on an alkene raises the energy of a stepwise transition state more than the energy of the competing concerted pathway. This energy shift induces CSI to react with monofluoroalkenes by a one-step process. The low reactivity of CSI with monofluoroalkenes, stereospecific
对于氯磺酰基异氰酸酯与一氟烯烃的亲电子加成反应,表明了一致的反应。烯烃上的乙烯基氟原子比竞争性一致途径的能量更多地提高了逐步过渡态的能量。这种能量转移促使CSI通过一步过程与单氟烯烃反应。CSI与单氟烯烃的低反应性,立体定向反应,与纯氟烯烃的2:1尿嘧啶产物的不存在以及量子化学计算均支持协调一致的途径。