Small Organic Peroxy Radicals – Table 4

Figure 4. Reaction 2 CH3O2 + CH3O2 Product Distributions

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Table 4. Reaction 2: CH3O2 + CH3O2 Product branching ratios at 298 K

Investigator Substrate/Technique Reportedak2a/k2 Reportedak2b/k2 Reportedak2c/k2 Norm.k2a/k2 Norm.k2b/k2 Temp range(K)
Parkes (1974) AZM/GC 0.33 0.67 n.d. 0.33 0.67 298
Weaver et al. (1975) AZM/MS 0.43 0.50 0.07b 0.46 0.54 298
Kan et al. (1980) AZM/FTIR 0.40 0.53 <0.07 0.43 0.57 298
Niki et al. (1981) AZM/FTIR 0.35 0.57 <0.08 0.38 0.62 298
Niki et al. (1981) CH4/FTIR 0.32 0.60 <0.08 0.35 0.65 298
Horie et al. (1990) CH4/MI 0.30 0.70 n.d. 0.30 0.70 223-333
Tyndall et al. (1998) CH4/FTIR 0.39 0.61 n.d. 0.39 0.61 298
Recommended 0.37 0.63

a) Reported yields are those given by the investigator, i.e., including the possibility of CH3OOCH3 formation in channel c. Normalized yields assume only channels 2a and 2b.

b) Also found a 14-22% yield of CD3OOCD3 from CD3 radicals.