摘要
A series of metal compounds containing tri-dentate monoanionic pyrrole-morpholine ligands was synthesized and characterized. The reaction of O(CH 2 CH 2 ) 2 NH·HCl, pyrrole and formaldehyde generated a new type of tri-dentate pyrrole-morpholine ligand, C 4 H 2 NH{2,5-[CH 2 N(CH 2 CH 2 ) 2 O] 2 } (1), in high yield. The reaction of 1 with one equivalent of AlMe 3 and ZnMe 2 in toluene generated AlMe 2 {C 4 H 2 N{2,5-[CH 2 N(CH 2 CH 2 ) 2 O] 2 }} (2) and {ZnMe{C 4 H 2 N{2,5-[CH 2 N(CH 2 CH 2 ) 2 O] 2 }}} 2 (4), respectively, in moderate yield. The reaction of two equivalents of 1 with Mg n Bu 2 in THF generated a bis-pyrrolyl Mg compound, Mg{C 4 H 2 N{2,5-[CH 2 N(CH 2 CH 2 ) 2 O] 2 }} 2 (THF) (3), in moderate yield. Compound 4 is sensitive to air and moisture and it decomposed into a hexa-Zn compound, {(ZnMe) 2 {C 4 H 2 N-{2,5-[CH 2 N(CH 2 CH 2 ) 2 O] 2 }(μ 4 -O) 2 (μ 2 -ZnMe) 2 } (5), when a small amount of moisture leaked into the flask during the recrystallization process. Compounds 1-4 were characterized by 1 H and 13 C NMR spectra and the structures of 1, 3, and 5 were also determined by single crystal X-ray diffractometry. Compounds 2 and 3 were tested as initiators for the ring opening polymerization of ε-caprolactone and 3 showed excellent activity.