摘要
A series of aluminum compounds containing tridentate pyrrolyl ligands were obtained from related aluminum dihydride compounds via protonolysis. Treatment of tetranuclear aluminum compound [C 4 H 2 N{2,5-(CH 2 NMe 2 ) 2 }Al 2 H 5 ] 2 (1) with two equivalents of [C 4 H 3 N{2,5- (CH 2 NMe 2 ) 2 }] in methylene chloride at 0 °C led to the formation of [C 4 H 2 N{2,5-(CH 2 NMe 2 ) 2 }]AlH 2 (2). Similarly, when the deuterated aluminum compound 1D was used, the corresponding aluminum compound [C 4 H 2 N{2,5-(CH 2 NMe 2 ) 2 }]AlD 2 (2D) could be isolated. The reaction of 2 with one or two equivalents of phenylethyne, triphenylmethanethiol, 2,6- diisopropylaniline, or triphenylsilanol generated mononuclear aluminum compounds [[C 4 H 2 N{2,5-(CH 2 NMe 2 ) 2 }]AlRR′ (3, R = -CCPh, R′ = H; 4, R = R′ = -CCPh; 5, R = -SCPh 3 , R′ = H; 6, R = R′ = -SCPh 3 ; 7, R = -NH(2,6- i Pr 2 Ph), R′ = H; 8, R = R′ = -NH(2,6- i Pr 2 Ph); 9, R = -OSiPh 3 , R′ = H; 10, R = R′ = -OSiPh 3 ). Related Al-D compounds of 3, 5, 7 and 9 were also synthesized and corresponding IR spectroscopic data well matched in comparison of the stretching frequencies of Al-H and Al-D. The molecular structures of 2D, 4, 5, 5D, 7, and 10 have been determined by X-ray crystallography. Compounds 2, 5, and 7 initiated the ring-opening polymerization of ε-caprolactone and produced high-molecular weight of poly-ε-caprolactone. © 2011 Elsevier B.V. All rights reserved.