The rate of association of n-propyl radicals has been measured by studying the photolysis of di-n-propyl ketone in intermittent light. A value of k2′=1×10—8 cc molecule—1 sec—1 at 100° has been obtained. Possible sources of error have been discussed and it is concluded that the above value may be too high by a factor of the order of 20, thus indicating that reaction probably occurs at every collision. A value of k3/k2=0.125±0.01 has been found, where k3 and k2 are the rate constants for disproportionation and combination, respectively.
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Whiteway et al. (1956) studied this question.
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