Tertiary α‐bromoalkyl aryl ketones 1 were converted into 2‐alkoxy‐2‐aryloxiranes 4 exclusively by reaction with excess potassium carbonate in the corresponding dry alcohol. Silver carbonate in a dry alcohol with these α‐bromo ketones yielded competitively formation of 2‐alkoxyoxiranes and semi‐benzilic Favorskii rearrangement (→5), while silver hexafluoroantimonate in the same medium afforded the latter rearrangement reaction exclusively.
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Kimpe et al. (1983) studied this question.
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