SYNTHESIS AND PROPERTIES OF GROUP-13 ELEMENT COMPOUNDS (AL,GA,IN) WITH THE POLYDENTATE YLAMINO)ETHYL]-2,3,4,5-TETRAMETHYLCYCLOPENTADIENYL LIGAND - X-RAY CRYSTAL-STRUCTURES OF (C(5)ME(4)CH(2)CH(2)NME(2))MX(2) (MX(2)=ALME(2), ALCL2, INCL2)

Several new group 13 element compounds containing the 1-[2-(dimethylam ino)ethyl] 2,3,4,5-tetramethylcyclopentadienyl ligand (Cp boolean AND) are described. Reaction of the respective element halide with Cp^Li l eads to the compounds 2-8 of the type (C(5)Me(4)CH(2)CH(2)NMe(2))-MX(2 ) [2, M = Al, X = CH3; 3, M = Al, X = C2H5; 4, M = Al, X = Cl; 5, M = Al, X = Br; 6, M = Al, X = I; 7, M = Ga, X = Cl; 8, M = In, X = Cl]. A ll compounds feature monomeric structures with intramolecularly coordi nated dimethylamino groups. The dynamic behavior in solution is based on fast haptotropic shifts in a ''windscreen-wiper'' type process. In the reaction of 5 with H3Al . NMe(3), the compound (C(5)Me(4)CH(2)CH(2 )NMe(2))Al(H)Br (9) is formed. The known correlation of the Al-27 NMR shift with the coordination number at aluminum can be extended to cycl opentadienyl compounds. The structures of 2, 4, and 8 were established by X-ray crystallography.