The Reactions of O(3P) with Terminal Alkenes: The H2CO Channel via 3,2 H-Atom Shift
详细信息 查看全文
- 作者：Hongmei Su ; Shaolei Zhao ; Kunhui Liu ; Tiancheng Xiang
- 刊名：Journal of Physical Chemistry A
- 出版年：2007
- 出版时间：September 27, 2007
- 年：2007
- 卷：111
- 期：38
- 页码：9600 - 9605
- 全文大小：114K
- 年卷期：v.111,no.38(September 27, 2007)
- ISSN：1520-5215
文摘
The step-scan time-resolved FTIR emission spectroscopy is used to characterize systematically the H2COchannel for the reactions of O(3P) with various alkenes. IR emission bands due to the products of CO, CO2,and H2CO have been observed in the spectra. H2CO is identified to be the primary reaction product whereasCO and CO2 are secondary reaction products of O(3P) with alkenes. A general trend is observed in which thefraction yield of the H2CO product increases substantially as the reactant alkene varies from C2H4, C3H6,1-C4H8, iso-C4H8, to 1-C5H10. The formation mechanism of the H2CO is therefore elucidated to arise from a3,2 H-atom shift followed by breaking of the C1-C2 bond in the initially formed energized diradical RCH2CHCH2O*. The 3,2 H-atom shift may become the dominant process with the more rapid delocalization ofthe energy when the hydrocarbon chain of the alkene molecule is lengthened.