Treatment of 1,2-bis(dichlorophosphino)benzene with tert-butylmagnesium chloride followed by magnesium powder cleanly forms the air-stable phosphacycle 1  as a racemic mixture. Recrystallization of the Pd-complex 2  , derived from {Pd[(S)-Me2NCH(Me)C10H6](�-Cl)}2, results in separation of diastereomers, which furnishes highly enantioenriched 1  on removal of the Pd fragment with dppe (1,2-bis(diphenylphosphino)ethane). Additions across the P-P bond of 1  yield bis(tertiary) phosphines, such as BenzP*. The synthesis, diastereomeric separation via 2  , and reactivity of 1  will be discussed.

<i>Tert</i>-butyl-diphosphabutarene: Synthesis and reactivity of a strained phosphacycle

243rd National Meeting (2012)

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Tert-butyl-diphosphabutarene: Synthesis and reactivity of a strained phosphacycle