Freeand Polymer-Bound Tricyclic Azaphosphatranes HP(RNCH 2 CH 2 ) 3 N + : Procatalysts in Dehydrohalogenations and Debrominations with NaH.-Primary and secondary alkyl bromides are efficiently dehydrobrominated. Vicinal dibromides are debrominated in the presence of catalytic amounts MAP or (XIV) and 2.5 equiv. NaH to give alkenes. A catalytic cycle is proposed in which hydride (from NaH) deprotonates the cation of MAP, liberating the catalytic base P(N(Me)-(CH 2 ) 2 ) 3 N, which earlier was shown to be super…
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