The reaction of secondary amines R′RNH with trimethyaluminum leads to the formation of dimeric aminoalanes [RR′NAlMe2]2 (1) (R = 2,6-Me2C6H3, R′ = SiMe2(2,4,6-Me3C6H2)) and 2 (R = Ph, R′ = SiMe3). Using a different stoichiometric ratio, a monomeric aminoalane [RR′N]2AlMe (3) (R = Ph, R′ = SiPh2Me) is obtained, having an aluminum atom of coordination number three due to the steric demand of the substituents. The synthesis of the corresponding aminogallanes 4, 5 and 6 is achieved by reaction of lithium amides LiNRR′ (R = Ph, 2,6-iPr2C6H3; R′ = SiMe3, SiMe2iPr) with dimethylgalliumchloride, Me2GaCl, in H-hexane. The formation of the dimeric species is in 1 through carbon while that in 2 and 3 is formed through nitrogen. The X-ray single crystal structure analysis of 1, 2, 3 and 4 are reported.
New aminometalanes of aluminum and gallium
Parisini E.
1998
Abstract
The reaction of secondary amines R′RNH with trimethyaluminum leads to the formation of dimeric aminoalanes [RR′NAlMe2]2 (1) (R = 2,6-Me2C6H3, R′ = SiMe2(2,4,6-Me3C6H2)) and 2 (R = Ph, R′ = SiMe3). Using a different stoichiometric ratio, a monomeric aminoalane [RR′N]2AlMe (3) (R = Ph, R′ = SiPh2Me) is obtained, having an aluminum atom of coordination number three due to the steric demand of the substituents. The synthesis of the corresponding aminogallanes 4, 5 and 6 is achieved by reaction of lithium amides LiNRR′ (R = Ph, 2,6-iPr2C6H3; R′ = SiMe3, SiMe2iPr) with dimethylgalliumchloride, Me2GaCl, in H-hexane. The formation of the dimeric species is in 1 through carbon while that in 2 and 3 is formed through nitrogen. The X-ray single crystal structure analysis of 1, 2, 3 and 4 are reported.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
