Complexes of Organoaluminium Compounds. Part 13. Preparation and Nuclear Magnetic Resonance Spectra of the Arylamido-compounds AlMe2(NHR') (R = Ph, C6H4Me-o, C6H4Me-p, C6H3-Me2-2,6) and the Imido-compounds AlMe2(NR'). Crystal and Molecular Structures of 2> and <<Al...

Article abstract of DOI:10.1039/DT9850001929

The compounds <m> (1) have been isolated.An X-ray study has shown that compound (1b) crystallises as centrosymmetrical trans dimers with the aromatic rings almost perpendicular to the (AlN)2 plane.The solid compound (1d) is also obtained as a trans dimer but full structural details have not been determined.In solution, however, all four compounds appear to exist as mixtures of two isomers which are probably trans dimers and trans trimers.On heating the amido-compounds (1) give methane and the imido-compounds <n> (2a)-(2d); there is no evidence for formation of mixed amido-imido-compounds.The compound <6> (2a) has been shown by an X-ray study to have a cage structure with S⁶ symmetry in the solid state, and the hexametric structure in the gas phase is confirmed by mass spectrometry.The o-tolyl derivate (2b) seems to give tetrametric molecules <4 and there is evidence that the p-tolyl compound may form a mixture of tetramers and hexamers.The compound <n)>3> appears from n.m.r. spectra to have the cis configuration in benzene, and <t)>2> the trans configuration. there is no evidence for mixtures of isomers.The thermal decomposition of <i)>2> appears to be catalysed by amines.

Full text of DOI:10.1039/DT9850001929

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