Gallium hydrides reactions with

Greenwood, N. N., and /. A. McGinnety Reactions of Decaborane with Adducts of Aluminium and Gallium Hydride Chem. Comm. 1965, 331. 

Lithium tetrahydridogallate(l —) is a moisture-sentitive solid similar in many respects to lithium tetrahydridoaluminate(l —). It reacts with protic solvents, but is soluble without reaction in a variety of ethers. The solid decomposes slowly at room temperature, but may be stored with decomposition at — 78° under an inert atmosphere or in vacuum. Ether solutions are stable for at least several days. A variety of gallium hydride derivatives may be prepared from Li[GaH4], including (CH3)3N GaH3.1,2,6 Infrared and Raman data have been reported for [GaH4]-.7... 

Both gallium hydride complexes are obtained as white, crystalline powders which remain white when stored at room temperature in the absence of air and moisture for periods in excess of one year. Their reaction with water is moderate when compared to the analogous aluminum hydride complexes. They undergo typical reactions for an [MH4] species, e.g.,... 

A mixed indium hydride halide complex, (l) InH2Cl (29) has been prepared from the 1 1 reaction of [InH2Cl(NMe3) ] with carbene (1) (R = Mes, R = H), as shown in Scheme iP The structure of (29) is monomeric with the geometry at the In center close to tetrahedral. The In-C distance (2.244(6) A) is similar to those observed in (28) (2.200(7) A) and (25) (2.253(5) A). A related mixed gallium hydride iodide complex (1) GaH2l (30) has been isolated from the reaction of (26) with GaT, with concomitant deposition of galhum metal. Complex (30) is isostructural with the related indium complex (29) and has a Ga-C bond distance of 2.022(4) A. 

The preparation of [Bu (H)Ga(/u,-NEt2)]2 was accomplished by the metathesis reaction between Bu Li with [Cl2Ga(/u,-NEt2)]2- Evidence suggests that two Bu groups are lost as isobutylene and result in Ga-H bond formation. The gallium hydride demonstrates high stability... 

An important property of transition metal hydride complexes in relation to their role as possible catalysts is their ability to add to olefins, often reversibly. This might be compared with the formally similar reaction of boron, aluminiiun and gallium hydrides which was described in Chapters 2 and 3. 

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