Alkoxohydridoaluminates. Part 2. The influence of alkyl substituents, solvent, and temperature on the molar fractions of components, equilibrium constants, and 27Al n.m.r. data for equilibrium mixtures containing Bu4N+AlH4-n(OR)n–

Molar fractions, equilibrium constants of mutual exchange, and 27Al n.m.r. data of compounds Bu4N+AlH4-n(OR)–n and the dependence of these on n(0–4); R (Me, Et, Nonyl, Pri, cyclo-C6H11 Ph, and But); solvent (benzene, tetrahydrofuran, 1,2-dimethoxyethane, diglyme); and temperature (23 and 70 °C) are presented. Predominant separation of cation from anion and, consequently, the slowest exchange, is found with Bu4N+AlH(OR)–3 and bulky R, in 1,2-dimethoxyethane at 70 °C. Such compounds, free of tetra-, tri- and di-hydrido components are expected to exhibit a very high reduction stereoselectivity proportional to the steric strain resulting from the presence of all three bulky alkoxy groups.