Isolation and Crystallographic Characterization of Allylindium Species Generated from Allyl Halide and Indium(0)

The reaction of cinnamyl bromide with indium(0) gave two allylindium species, cinnamylindium dibromide and dicinnamylindium bromide. Either species were isolated after complexation of appropriate pyridine-type Lewis bases. The use of 3,5-dibromopyridine (Br2py) as a Lewis base gave cinnamylindium dibromide with two Br2py ligands. Dicinnamylindium bromide was isolated with 4-(dimethylamino)pyridine (Me2Npy) ligands. In both cases, the indium atom showed a trigonal-bipyramidal coordination sphere with the cinnamyl group(s) and bomine atom(s) in equatorial and the pyridine-type ligands in axial positions. The cinnamylindium bromide transformed to dicinnamylindium bromide with formation of InBr3 in the presence of Me2Npy. The dicinnamylindium bromide had a higher reactivity than the monoallyl compound for carbonyl addition.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

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