Alkoxo and Amido Compounds of Group 13

Abstract

The reaction of Al with alcohols like PhCH₂OH or ^cHexOH gives the neutral alkoxo derivatives Al(OCH₂Ph)₃ 1 and Al(O^cHex)₃ 2. Both compounds are tetrameric in solution. The first is a tetramer in the solid state while the latter is a trimer. The treatment of Li[AlH₄] with PhCH₂OH yields the polymeric metalate [Li{Al(OCH₂Ph)₄}]_n [3]_n. The metathesis reaction of AlCl₃ with LiO^tBu leads to the LiCl adduct [{(THF)Li}₂{Al(O^tBu)₄}Cl] 4 possessing a polymeric structure mediated by Li-Cl-Li bridges. Amides such as Ga(N^cHex₂)₃ 6 and amido metalates such as [Li(THF)₄][M{N(CH₂Ph)₂}₄] 7 (M = Al – In 7a – 7c) are the result of the reaction of MCl₃ with the corresponding lithium amide. The red solutions, appearing during the reactions with LiN(CH₂Ph)₂, are due to the anion [N(CHPh)₂]⁻. [{(THF)Cs} {N(CHPh)₂}] 8 can be obtained as major product by treatment of HN(CH₂Ph)₂ with Cs in THF.

Keywords::

• Aluminium compounds
• gallium compounds
• indium compounds
• cesium compounds