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Formation rates of allylic radicals have been observed directly for the first time to be 4×107 s−1 by photodissociation of 2,3,3-trimethyl-1-butene and to be 2×107 s−1 from 2,3-dimethyl-2-pentene at low pressure by excitation with an ArF laser.
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Nakashima et al. (1984) studied this question.
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