Rate Constants and Mechanism for Reactions of Ketenes with OH Radicals in Air at 299±2K
作者:Shiro Hatakeyama、Shigeo Honda、Nobuaki Washida、Hajime Akimoto
DOI:10.1246/bcsj.58.2157
日期:1985.8
(10±3)×10−11 cm3 molecule−1 s−1 for ketene, MK, EK, and DMK, respectively. The major product was a carbonyl compound; HCHO from ketene, CH3CHO from MK, and CH3COCH3 from DMK; the yield was ≈80%, 72±17%, and 70±3%, respectively. It is proposed that the reaction proceeded mainly via an OH addition to the olefinic carbons of ketenes and the adduct decomposes to give a carbonyl compound and CO as final products in
OH 自由基与四种简单的乙烯酮(乙烯酮、甲基乙烯酮:MK、乙基乙烯酮:EK 和二甲基乙烯酮:DMK)在 1 个大气压的空气中在 299±2 K 下通过竞争反应方法测量反应的速率常数。CH3ONO 在空气中的光解作用用于产生 OH 自由基。得到的OH反应速率常数为(1.8±0.2)×10-11、(7.6±1.4)×10-11、(11±3)×10-11和(10±3)×10-11 cm3分子-乙烯酮、MK、EK 和 DMK 分别为 1 s−1。主要产物是羰基化合物;HCHO来自乙烯酮,CH3CHO来自MK,CH3COCH3来自DMK;产率分别为 ≈80%、72±17% 和 70±3%。提出该反应主要通过将 OH 加成到乙烯酮的烯烃碳上进行,加合物在空气中分解得到羰基化合物和 CO 作为最终产物。