I

CHg CHg

II ch3 ch3

Decomposition

CHg CHg ono,

FIGURE 6.9 Expected atmospheric fates of peroxy radical formed in NO, addition to 2,3-dimethyl-2-butene.

formation of 4-nitroxy-3-methyl-2-butenal as a major product (e.g., Jay and Stieglitz, 1989; Barnes et al., 1990; Skov et al., 1992; Kwok et al., 1996c; Berndt and Böge, 1997):

4-Nitroxy-3-methyl-2-butenal

Also formed are a variety of hydroxynitrates, nitro-oxyhydroperoxides, and hydroxycarbonyls anticipated from the reactions of alkylperoxy and alkoxy radicals formed after the initial addition of NO, to the double bond (e.g., Kwok et al., 1996c). The yield of 4-nitroxy-3-

methyl-2-butenal decreases with increasing NO concentrations, while the yields of methyl vinyl ketone and methacrolein increase (Berndt and Boge, 1997). This has been attributed to the decomposition of the alkoxy radicals formed after 1,2-addition, e.g.,

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