Formyl radical with molecular oxygen

Peroxy radicals are also formed in the troposphere through the photolysis of aldehydes (10, 11) and through nitrate radical (N03) reactions (12-14). The hydrogen atom and formyl radical that are formed then react with molecular oxygen (02) (reactions 11 and 12) under tropospheric conditions. 

The pentadiene formyl radical C4C DO (Path-2) reacts further by beta scission to form CO and butadienyl-1 (CDCCDC ) via a barrier of 39 kcal mof. The butadienyl-1 can undergo elimination, which has a 40 kcal mof barrier, to form vinyl radical and acetylene or react with molecular oxygen with no barrier. 

The opened ring adduct (ODC6 DO) is shown in Figure 6.7 to have two low energy channels formation of a five member ring, (formyl cyclopentenone-yl radical) and a beta scission to CO and a vinylic 0=C—C=C—C=C radical. This vinylic radical will further beta scission (unzip) to two acetylenes, two CO and one H radical or rapidly react with molecular oxygen. 

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