Organoaluminium and -gallium compounds with o-oximato substituents

Mitzel NW, Lustig C, Woski M. Organoaluminium and -gallium compounds with o-oximato substituents. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES. 2003;58(5):363-368.The organoaluminium and -gallium acetonoximates (tBu(2)MON=CMe2)(2) (M=Al, Ga) have been prepared by the reaction of acetoneoxime with tri-tert-butylaluminium and -gallium. The compounds (Me2MON=CMe2)(2) (M=Al, Ga), described previously, were synthesized for comparison. All compounds have been characterised by NMR spectroscopy (H-1, C-13, Al-27), by mass spectrometry and elemental analyses. The crystal structures of the four compounds have been determined, and it was shown that all form dimers with six-membered M2O2N2 rings by aggregation through the imino N atoms. The compounds (Me2MON=CMe2)(2) adopt boat conformations, whereas the compounds (tBu(2)MON=CMe2)(2) prefer chair conformations. Large differences in the M-O-N angles have been found between the methyl and the tert-butyl analogues