Some amino- and oxy-beryllium hydrides: 2-dimethylaminoethyl(methyl)aminozinc hydride dimer

Abstract

Beryllium hydride eliminates one mole of hydrogen on reaction with trimethylethylenediamine, giving an aminoberyllium hydride which is trimeric in benzene (cryoscopically), (HBeNMe·C₂H₄·NMe₂)₃, and sublimes undecomposed. Zinc hydride gives a dimeric amino-hydride, (HZnNMe·C₂H₄·NMe₂)₂.

Evidence for exchange between di-isobutylaluminium hydride and both methylberyllium t-butoxide and beryllium di-t-butoxide was obtained, from magnetic resonance spectra in the latter case, but no definite alkoxyberyllium hydride could be isolated. Diphenylmethoxyberyllium hydride is formed by addition of beryllium hydride to benzophenone in tetrahydrofuran; it is oligomeric, (HBeOCHPh₂)_7–8, in benzene. A similar reaction with benzylideneaniline gives an aminoberyllium hydride, isolated as a tetrahydrofuran complex, HBeNPh·CH₂·Ph,THF. This dissociates in benzene, and forms a 4-dimethylaminopyridine complex which is only sparingly soluble in benzene.