Gallane synthesis

Halogeno(phenyl)(organylthio)gallanes - synthesis, reactaivity, and properties, G.G. Hoffmann and H. Meixner, Z.Anorg.Allg.Chem.. 1985, 523, 121. 

Monomeric compounds (x = 1) containing M=E double bonds remained unknown until Power and Roesky et al. reported in 2001 on the synthesis of the first monomeric iminoalane and -gallane by oxidative addition of an organoazide to a sterically encumbered low-valent A1(I) compound 4 This reaction type has been shown previously to yield heterocyclic compounds by use of sterically less hindered [Cp Al]4.145 Very recently, von Hanisch and Hampe synthesized the first GaAs compound featuring a Ga=As double bond5 (Scheme 19, Figs. 41 and 42). 

Gallane, 41 172-173, 196-198 chemical analysis, 41 199, 201 chemical properties, 41 208-209 complexes, 41 175-178 electron diffraction, 41 204-207 2-galla-arachno, tetraborane, 41 216-220 gallaborane, 41 211-216 H NMR spectrum, 41 207-208 IR spectrum, 41 200-202 physical properties, 41 199 search for, 41 173-175 synthesis, 41 198-199 vibrational spectra, 41 200-215 2-Galla-araclino-tetraborane, 41 216-220 "B NMR spectrum, 41 217, 219-220 decomposition of vapor, 41 216-217 electron diffraction, 41 218 structure, 41 217-218 Gallium... 

Wells et al. reported almost twenty years ago on the reactions of chloro-gallanes and trimethylsilyl-substituted arsanes R 2AsSiMe3, which occurred under elimination of MesSiCl and subsequent formation of arsinogallanes of the types [Cl2GaAsR 2]%> RGa(AsR2)2 and Ga(AsR2)3 [23]. In 1988, Cowley et al. extended this reaction type to the synthesis of heterocyclic stibinogal-lanes and -indanes [21]. 

In this section we present the synthesis of adducts of some gallium trihydride (gallane) compounds which are remarkably thermally stable.2 12 13... 

Fig. 2. Pyrex glass apparatus used (a) for the synthesis and sampling of a base-free gallane and (b) for the admission of the gallane vapor to the chamber of the electron-diffraction apparatus. In (a) A is a sample of [H2GaCl]2 Bj, B2, and B3 are greaseless valves C is freshly prepared LiGaH4, LiBH4, or [Bu"4N][B3H8] Dj, D2, and D3 are U-tube traps for fractionation of the volatile components of the reaction mixture and E is an NMR tube (reproduced with permission from Ref. 56 copyright 1991, American Chemical Society).

The presence of a stable diborane-like molecule [H2Ga(/x-H)]2 in both solution and the vapor phase suggests that the chemistry of gallane has a marked similarity to that of diborane, that is, (1). The analogy between the gallium and boron hydrides is extended by the synthesis and structural characterization of the mixed gallaborane, GaBHe (1). 

Synthesis, Structure, and Reactions of Tris(trimethylsilyl)silyl Gallanes and Gallates... 

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