It is reported and explained that the front-like reaction sustains, and its velocity is enhanced in frozen phase in the chlorite-thiosulphate system.

The role of ethenoxy radicals in the pyrolysis of CHaCDO was studied by mass spectrometric analysis of the isotopic composition of the methane, ethane, and recovered aldehyde. CH3 + CHSCDO -CH3D + CH3CO CH3 + CH3CDO -CH4 + CHzCDO CHa + CH3CHO -CH4 + CH3CO CH3 + CHSCHO CHI + CHZCHO furnished the rate constant ratios (kb + kib)/kla = 2.7 and klb/kla = 0.62 at 785°K. It is concluded that at the usual temperatures of CH3CHO pyrolysis the rate of alkyl hydrogen capture is comparable to that of formyl hydrogen abstraction.The results and conclusions are discussed and compared with previous work.

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