Abstract
1,2-Di-tert-butyldiphosphane monoxide (2) and 1,2-di-tert-butyldiphosphane dioxide (3) have been prepared by reacting 1,2-di-tert-butyldiphosphane (1) with cum ene hydroperoxide and pure oxygen, respectively. Both compounds are formed as red trans-oriented tert-butyl substituents.

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