Azomethine derivatives. Part X. 1,1,3,3-Tetramethylguanidine adducts of trimethylaluminium, triethylaluminium, and aluminium trichloride: dimethyl-, diethyl-, and dichloro-bis(dimethylamino)methyleneamino-aluminium

Abstract

The adducts (Me₂N)₂C:NH,AlX₃(X = Me or Et), from (Me₂N)₂C:NH +½(or more) Al₂X₆ in hexane, are monomeric in dilute benzene solution and are believed to have a structure co-ordinated through the imino-nitrogen. They lose XH when heated, forming [(Me₂N)₂C:NAIX₂]₂, for which four-membered ring structures are suggested. Although the adduct (Me₂N)₂C:NH,AlCl₃ does not similarly afford [(Me₂N)₂C:NAICl₂]₂ when heated, the latter can be prepared from (Me₂N)₂C:NLi and AlCl₃. I.r. spectroscopic details are given for all these new compounds. Also discussed are the ¹H n.m.r. spectra of the alkylaluminium compounds and the mass spectra of (Me₂N)₂C:NH,AICl₃ and [(Me₂N)₂C:NAIEt₂]₂.