The gas phase sabinene + OH reaction is studied both experimentally and theoretically. Product yields from the reaction of sabinene with OH radicals have been measured in the absence of NOx in the UCC chamber (Cork, Ireland) and in the presence of NOx in the LISA chamber. Three primary carbonyl compounds were observed and quantified: acetone in [(24 ± 6)%], formaldehyde in [(25 ± 6)%] and sabinaketone in [(20 ± 6)%]. The simultaneous quantification of these compounds is one of the major results of this work. The mechanism of product formation for this reaction has been studied using the quantum chemical DFT-B3LYP (6-31G(d,p) method. According to these calculations, the H-atom abstraction channel from sabinene by OH in the initial oxidation step may be taken into account to explain the acetone production. Sabinaketone and formaldehyde are mainly products of the addition channels of OH on the –CCH2 double bond of sabinene. This is the first theoretical work on the title reaction.
通过实验和理论研究了气相中的沙比利烯 + OH 反应。在 UCC 试验室(爱尔兰科克)没有氮氧化物的情况下,以及在 LI
SA 试验室有氮氧化物的情况下,测量了
桧烯与 OH 自由基反应的产物产量。观察并量化了三种主要羰基化合物:
丙酮([(24 ± 6)%])、
甲醛([(25 ± 6)%])和沙比利酮([(20 ± 6)%])。同时对这些化合物进行定量是这项工作的主要成果之一。采用量子
化学 DFT-B3LYP (6-31G(d,p) 方法研究了这一反应的产物形成机理。根据这些计算结果,在最初的氧化步骤中,羟基从沙比利烯中抽取 H 原子的通道可以用来解释
丙酮的生成。桧酮和
甲醛主要是 OH 在
桧烯的 -CCH2 双键上加成通道的产物。这是对该反应的首次理论研究。