SYNTHESIS AND CHARACTERIZATION OF ME(3)GA AND ME(3)IN - ADDUCTS OF SECONDARY-AMINES

The reactions of trimethylgallium and trimethylindium with a variety o f secondary amines [HNMe(2), HNEt(2), HNPr2n, HNPr2i, HNBu(2)(n), HNBu (2)(i), HNBu(2)(s), HN(CH(2)Ph)(2), HN(c-C6H11)(2), HNC4HB8 HNC5H10, H NC6H12 and HN(CH(2)CH2)(2)NMe], produce a series of room-temperature s table liquid or solid adducts. These were characterized by H-1 and C-1 3 NMR, IR, mass spectrometry and elemental analysis. Spectroscopic com parisons are made between these and the corresponding trimethylaluminu m derivatives. H-1 and C-13 NMR data for all three series of adducts i ndicate a correlation between the chemical shifts of the methyl groups on the metal and the relative steric requirements of the amines. The data show a general downfield movement of these chemical shifts with i ncreasing steric bulk.