The Monomeric Alanediyl AlAr (Ar = CH-2,6-(CH-2,4,6-Pr)-3,5-Pr): An Organoaluminum(I) Compound with a One-Coordinate Aluminum Atom.

Reduction of the aluminum iodide AlIAr (; Ar = CH-2,6-(CH-2,4,6-Pr)-3,5-Pr) with 5% w/w Na/NaCl in hexanes gave a dark red solution from which the monomeric alanediyl AlAr () was isolated in ca. 28% yield as yellow-orange crystals. Compounds and were characterized by X-ray crystallography, electronic and NMR spectroscopy, and theoretical calculations. The Al atom in is one-coordinate, and the compound displays two absorptions in its electronic spectrum at 354 and 455 nm. It reacts with H under ambient conditions to give the aluminum hydride {AlH(μ-H)Ar}, probably via a weakly bound dimer of as an intermediate.