Coordination compounds of methyl gallium hydrides

Abstract

Although the organo hydride derivatives of boron and aluminium are well characterized, little work has been reported on the corresponding galliunl systems. The present s t~~d y was initiated to determine the relative stabilities of organo gallium hydride derivatives as compared to the stabilities of the corresponding compounds of boron and aluminium. Various preparative routes in this new class of gallium con~pounds have been investigated. Theseincludc the usc of organo mercury and organo lithium reagents in reactions with gallium hydride coinpounds and their halogen substituted derivatives, and also equlibration reactions between gallium hydride and organo gallium compounds. Both infrared and proton magnetic resonance spectroscopy techniques have been used extensively in following the progress of tltesc reactions and in the characterization of the products.

Syntheses, Characterization, and X-ray Crystal Structures of β-Diketiminate Group 13 Hydrides, Chlorides, and Fluorides

“…33,39,40 Most common are the Lewis base adducts of group 13 metal hydrides. 38,41 Thus, GaH 3 ‚NMe 3 is stable below room temperature but its shelf life is considerably lower at room temperature. Therefore, it is a synthetic challenge to prepare stable mono-and dihydrides of gallium.…”

“…Attempts have been devoted to increase the stability of these compounds by coordination of an ancillary ligand to the gallium atom. These are among the most easily accessible, more stable, and, usually, more malleable than the parent hydrides. ,, Most common are the Lewis base adducts of group 13 metal hydrides. , Thus, GaH 3 ·NMe 3 is stable below room temperature but its shelf life is considerably lower at room temperature. Therefore, it is a synthetic challenge to prepare stable mono- and dihydrides of gallium.…”

“…27 Al NMR (78.2 MHz, C 6 D 6 , TMS): δ 66.9 (s, w 1/2 ) 1350 Hz). MS [EI; m/z (%)]: 482 (100) [M + ], 467 (41) [M + -Me], 447 (18) [M + -MeH -F]. IR (Nujol, cm -1 ): ν ˜1539, 1318, 1255, 1177, 1102, 1030, 937, 900, 817, 803, 758, 719, 448, 412.…”

Infrared laser powered pyrolysis of triethylgallane: first evidence for a free monoalkylgallane

“…There have been no reports of free monoalkylgallanes, (RGaH2),, although NMR and IR evidence for adducts such as MeGaH2.NMe3 has been presented. 5 In the past few years, however, a number of novel routes to gallanes have been reported, including the elusive parent Ga2H6. 6 We recently reported the synthesis of diethylgallane, Et2GaH, in the infrared laser powered homogeneous pyrolysis (IR LPHP) of triethylgallane via the (3-elimination reaction,7 eqn.…”