AN INTRAMOLECULARLY BASE-STABILIZED MONOMERIC ORGANOALUMINUM DIHYDRIDE

The intramolecularly base-stabilized arylaluminum dihydride [2,6-(Me(2)NCH(2))(2)C6H3]AlH2 (1) has been prepared by the metathesis reaction of the corresponding lithium aryl with AlH2Cl.NMe(3). Alternative methods for the synthesis of 1 are transmetalation or reduction reactions of [2,6-(Me(2)NCH(2))(2)C6H3]MCl(2) (M = Al (2), Ga (3), In (4)) with LiAlH4. The X-ray crystal structures of 1 and 2 have been determined: 1, orthorhombic, Pbca, with a = 17.179(3), b = 9.014(20, c = 12.707(3) Angstrom, V = 2794(1) Angstrom(3) and Z = 8; 2, monoclinic, C2/c, with a = 8.2880(10), b = 17.022(2), c = 14.381(3) Angstrom, beta = 99.46(1)degrees, V = 2001.2(5) Angstrom(3), and Z = 4. Compounds 1 and 2 are monomeric in the solid state.