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Treatment of 1,2-diols with diphenylphosphinoyl chloride in pyridine produces β-chloroethyl phosphinates which react with complete control of stereochemistry to give epoxides and azido-alcohols, useful intermediates in cyclopropane synthesis.

Graphical abstract: Diphenylphosphinoyl chloride as a chlorinating agent – the selective double activation of 1,2-diols

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