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2 species. The variable-temperature, multinuclear NMR study of the Me 2 AlH/ P(SiMe 3 ) 3 system indicated adduct formation at -90 °C and subsequent conversion to cyclic oligomeric [Me 2 AlP(SiMe 3 ) 2 ] n [Me 2 AlH] m species at -80 °C that ultimately produced [Me 2 -AlP(SiMe 3 ) 2 ] 2 . The reactivity of Bu i 2 AlH toward P(SiMe 3 ) 3 and HP(SiMe 3 ) 2 is much slower then that of Me 2 AlH. In the Bu i 2 AlH/HP(SiMe 3 ) 2 system, H 2 elimination is favored and [Bu i 2 -AlP(SiMe 3 ) 2 ] 2 and Bu i 2 AlP(SiMe 2 ) 2 ‚Bu i 2 AlP(H)SiMe 3 are formed. An X-ray structure analysis of [Bu i 2 AlP(SiMe 3 ) 2 ] 2 establishes the planarity of the (AlP) 2 core.Recently we reported the reactivity of Me 2 AlH with HP(SiMe 3 ) 2 , 26 wherein the preferred mode of reactivity is HSiMe 3 sas opposed to H 2 selimination. Transpho-

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