Intramolecular, Metallacyclic Organoaluminium, -gallium and -indium Addition Compounds Crystal Structure of 1-Galla-5-azabicyclo[3.3.3]undecane

Intramolecularly base‐stabilized four‐coordinated metallacyclic organoaluminium, ‐gallium, and ‐indium compounds C5H10‐Al(CH2)3NMe2 (4), C4H8Ga(CH2)3NMe2 (5), C5H10Ga(CH2)3N‐Me2 (6), C5H10GaCH2CH(Me)CH2NMe2 (7), C4H8Ga(CH2)4NMe2 (8), C5H10Ga(CH2)4NMe2 (9), EtAl[(CH2)3]2NMe (10), MeGa‐[(CH2)3]2NMe (11), EtGa[(CH2)3]2NMe (12), MeIn[(CH2)3]2NMe (13), and (14) have been synthesized by the reaction of [3‐(dimethylamino)propyl]aluminium dichloride (1), [3‐(dimethylamino)propyl]gallium dichloride (2), [3‐(dimethylamino)‐2‐methylpropyl]gallium dichloride (3), or [4‐(dimethylamino)butyl)gallium dichloride with the respective bis‐Grignard reagents or by the reaction of the organometal dichlorides RMCl2 with bis[3‐(chloromagnesio)propyl]methylamine or with N,N′‐bis[3‐(chloromagnesio)propyl]‐N,N′‐dimethyl ethylenediamine. Aluminium or gallium trichloride reacts with tris[3‐(chloromagnesio)propyl]amine to give Al[(CH2)3]3N (15) and Ga[(CH2)3]3N (16). The 1H‐, 13C‐NMR and mass spectra of the new compounds as well as the X‐ray crystal structure of 16 are discussed. 4, 6, and 12 have been tested successfully as MOVPE precursors.