摘要
Pyrrole and keto-amine based morpholine ligands are conveniently synthesized and their corresponding Al-compounds are afforded accordingly. The combination of 1, {C 4 H 3 NH-2-[CH[dbnd]NCH 2 CH 2 N(CH 2 CH 2 ) 2 O]} and two equivalents of PhNCO generates compound 3, {C 4 H 3 N(CONPh)CH[sbnd]N(CONPh)(CH 2 ) 2 NC 4 H 4 O} in relatively high yield. In addition, reacting 1 with one and two equivalents of AlMe 3 in toluene render mono- and di-aluminum compounds, AlMe 2 {C 4 H 3 N[2-CH[dbnd]NCH 2 CH 2 N(CH 2 CH 2 ) 2 O]} (4) and AlMe 2 {C 4 H 3 N[2-CH[dbnd]NCH 2 CH 2 N(CH 2 CH 2 ) 2 O]AlMe 3 } (5), respectively. Similarly, reactions of morpholine bounded keto-amine ligands OCMeCHCMeNHCH 2 CH 2 N(CH 2 CH 2 ) 2 O (2a) and OCPhCHCMeNHCH 2 CH 2 N(CH 2 CH 2 ) 2 O (2b) with one and two equivalents of AlMe 3 result the formation of mono- and di-aluminum compounds, AlMe 2 {OCRCHCMeN[CH 2 CH 2 N(CH 2 CH 2 ) 2 O] (6a, R = Me; 6b, R = Ph) and AlMe 2 {OCRCHCMeN[CH 2 CH 2 N(CH 2 CH 2 ) 2 O]·AlMe 3 (7a, R = Me; 7b, R = Ph), respectively in moderate yield. Compounds 1, 3, 4 and 6b are subjected to X-ray diffraction analysis to ensure the geometry around Al atom. All the aluminum compounds could effectively commence the ring-opening polymerization (ROP) of ε-caprolactone in a well-controlled manner with molecular weight distributions (PDI = 1.08–1.37).