Oxidation of the smaller alkenyl radicals at high temperatures

6 Oxidation of the smaller alkenyl radicals at high temperatures 

Further consideration of the behaviour of the smaller alkenyl radicals at temperatures near to 1000 K is merited. As indicated earlier, methylallyl radicals undergo C—C homolysis to some extent at 750 K. 

Homolysis of allyl radicals may become important, but the energy barrier is very high due to electron delocalization AHjsa = 200 and 733 = 240 kJ moP whilst = 240 and E-,2,b = 260 kj moP.  

CH3CH=CH + M CH3 + C2H2 + M CH3C=CH2 -h CH2CHCH2 -H M CH3CH=CH + O products CH3C=CH2 -I- O — products 

Further study of the chemistry of alkenyl radicals in the range 1000-2000 K and up to pressures of 30 atms is required, with particular emphasis on the smaller electron-delocalized radicals. Gutman et al. [103] have investigated the reactions of highly unsaturated alkenyl radicals with O2, but at temperatures well below 1000 K. 

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