Reactions of free radicals with sulphur dioxide. Part II - ethyl radicals

Anthony Good, John C.J. Thynne

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The reaction of sulphur dioxide with ethyl radicals, generated by the photolysis of diethyl ketone, has been studied in the temperature range 28-75°C. At low temperatures the addition reaction to form ethylsulphonyl radicals is rapid but the radicals become increasingly unstable as the temperature is raised. Arrhenius parameters (based on a value of 1014 mole-l cm3 sec-l for the rate of combination of ethyl radicals) have been measured or deduced for the following reactions : 
                                                         log A (mole-l cm3 sec-l)   E (kcal mole-l)

C2H+ C2H5COC2H5 → C2H6+C5H9O          11.45                        8.1 
                       2C2H5 → C2H4 + C2H6          13.13                        0
               C2H5 + SO2 → C2H5SO2                    11.0                         3.1                    
                   C2H5SO2 → C2H5 + SO2                14.4 (sec-1)           19.9                     
A value of 0.05 ±0.04 has been obtained for the disproportionation : combination ratio of ethyl and ethylsulphonyl radicals, Δ(C2H5, C2H5SO2). The addition reaction of ethyl radicals with various molecules has been discussed and their reaction with oxygen shown to be much faster than their reaction with sulphur dioxide, the difference being much more marked than with methyl radicals.

Original languageEnglish
Pages (from-to)2720-2727
JournalTransactions of the Faraday Society
Publication statusPublished - 1967


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