The title selenoxide provides a new oxidizing system in combination with catalytic selenium dioxide for oxidation of benzyl alcohols to benzaldehydes. An effective redox cycle between selenium and the dioxide is suggested.

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The title selenoxide was found to serve as a suitable agent for Kornblum oxidations of various benzyl bromides to the corresponding carbonyl compounds. On the other hand, the analogous sulfoxide and telluroxide hardly promoted such oxidations.

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