Cyclic imino derivatives of aluminium, gallium, and indium dialkyls
- 1 January 1971
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 3850-3854
- https://doi.org/10.1039/j19710003850
Abstract
A series of volatile cyclic imino-compounds, [[graphic omitted]·MR2]n, (x= 1, 2, 3, or 4; M = Al, Ga, or In; R = Me, Et, or Bui) has been prepared and characterized by elemental analysis molecular-weight determinations, and 1H n.m.r. and mass spectroscopic measurements. The effects of varying x, M, and R on the degree of association, n, of the monomer units have been studied. In all cases with x= 1 and R = Me the compounds are trimeric. Replacement of methyl groups in the aziridino-derivatives by ethyl groups yields a dimeric product for the gallium compound but the bulkier isobutyl groups are required to effect a similar change in association for the aluminium derivative. When x= 2, 3, or 4 dimeric compounds were obtained with the one exception of azetidino-aluminium dimethyl. For this compound a novel equilibrium between trimer and dimer was evident in benzene solution. Thermodynamic parameters for this equilibrium have been obtained from 1H n.m.r. measurements taken over a range of temperatures.Keywords
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