A combined crossed beam and <i>ab initio</i> investigation on the reaction of carbon species with C4H6 isomers. III. 1,2-butadiene, H2CCCH(CH3) (X 1A′)—a non-Rice–Ramsperger–Kassel–Marcus system?
作者:N. Balucani、H. Y. Lee、A. M. Mebel、Y. T. Lee、R. I. Kaiser
DOI:10.1063/1.1385794
日期:2001.9.15
Crossed molecular beam experiments were conducted to investigate the reaction of ground state carbon atoms, C(3Pj), with 1,2-butadiene, H2CCCH(CH3) (X 1A′), at three collision energies of 20.4 kJ mol−1, 37.9 kJ mol−1, and 48.6 kJ mol−1. Ab initio calculations together with our experimental data reveal that the reaction is initiated by a barrier-less addition of the carbon atom to the π system of the
进行交叉分子束实验以研究基态碳原子 C(3Pj) 与 1,2-丁二烯 H2CCCH(CH3) (X 1A') 在 20.4 kJ mol-1、37.9 的三种碰撞能量下的反应kJ mol-1 和 48.6 kJ mol-1。从头算计算和我们的实验数据表明,反应是通过将碳原子无障碍地添加到 1,2-丁二烯分子的 π 系统中来引发的。受大冲击参数支配,C(3Pj) 优先攻击 C2-C3 双键形成 i1(机制 1);在较小程度上,小的影响参数会导致向 C1-C2 键添加原子碳,从而产生 i2(机制 2)。环状中间体 i1 和 i2 均对三重甲基丁三烯配合物 i3' (H2CC*CCH(CH3)) 和 i3" 开环,(H2CCC*CH(CH3));C* 表示被攻击的碳原子。