Free-radical addition reaction of organoboranes to α, β-unsaturated ketones forms corresponding vinyloxyboranes (3) as the intermediate. Methanolysis of the dibromoderivatives which should be obtained by bromination of the initially formed vinyloxyboranes provides a convenient one-step synthetic procedure of α-bromoketones from organoboranes in good yields.
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Miyaura et al. (1973) studied this question.
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