Flowing afterglow study of the gas phase nucleophilic reactions of some formyl, acetyl and cyclic esters
作者:Brian T. Frink、Christopher M. Hadad
DOI:10.1039/a905632g
日期:——
A variety of nucleophiles have been investigated for their reactions with formyl and acetyl esters in the gas phase in our flowing afterglow. The reactions that are permitted in the gas phase are more varied than those seen in the condensed phase. The rates of reactions of methyl and ethyl esters as well as various lactones have been undertaken with various nucleophiles: H2N–, HO–, CH3O–, NCCH2–, F–
在流动的余辉中,已经研究了多种亲核试剂与气相中甲酰基和乙酰基酯的反应。气相中所允许的反应比冷凝相中所见的反应变化更大。甲基和乙基酯以及各种内酯的反应的速率已进行与各种亲核试剂:H 2 Ñ -,HO -,CH 3 ö -,NCCH 2 -,F -,CH 3 C(O)CH 2 -,CH 3 S –和O 2 NCH 2 –。例如,已发现NCCH 2 – + HCO 2 CH 2 CH 3的反应速率为(1.3±0.2)×10 –10 cm 3分子–1 s –1,唯一的产物是HC(O –)CHCN这是由于亲核酰基取代(B AC 2),然后在离子-分子络合物中进行质子转移所致。已经观察到的其他反应机理包括β-消除(E2),烷基上的双分子亲核取代(BAL 2)和Riveros反应(消除CO)。F – + HCO 2的机制已在B3LYP / 6-31 + G(d)水平确定了CH 3反应。最值得注意的是,通道是通过计算确定的(BAL