The divergent reactivity of β-diketiminato aluminium hydrides with organophosphoryl compounds†
*b
Herbert W.
Roesky
*c
Abstract
The reactions of LAlH2 (L = HC(CMeNAr)2, Ar = 2,6-iPr2C6H3) (1) with diphenylphosphane oxide [Ph2P(O)H], diphenylphosphinamide [Ph2P(O)NH2], and diaryl/alkyl phosphane [(RO)2P(O)H (R = Ph, or iPr)] afford their corresponding compounds with compositions LAl(H)OP(Ph)2 (2), LAl[OP(Ph)2]2 (3), LAl{[N(H)P(O)(Ph)2][OP(Ph)2]} (4), LAl(OiPr)2 (5), and LAl(OPh)2 (6), respectively. These reactions probably undergo a process of dehydrogenation coupling, deaminating dehydrogenation coupling, or chain-breaking coupling. It is noteworthy to mention that the reaction of compound 1 with 2 equiv. of Ph2P(O)NH2 results in 4 and its isomer 4a, where both the complexes exhibit different coordination towards the aluminium centre. The structure of 4a is very rare, where the aluminium centre connects with a nacnac ligand as well as with N and O to form a six-membered and a four-membered ring, respectively. All the compounds were well characterized by multinuclear NMR spectroscopy, elementary analysis, and single-crystal X-ray diffraction.
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