名称:
                                Zinc complexes incorporating with symmetrical and asymmetrical polydentate nitrogen-donor pyrrolyl ligands: Synthesis, characterization, and ring-opening polymerization
                             
                            
                                摘要:
                                The reactions of Zn-alkyls with bidentate as well as symmetrical and asymmetrical tridentate pyrrolyl ligands, have been carried out and characterized. Reacting ZnR2 with 1 equiv of C4H3NH(2-(CH2NHBu)-Bu-t) in diethyl ether yields [Zn{C4H3N(2-(CH2NHBu)-Bu-t)}R] (1, R Me; 2, R Et) in high yield. Similarly, the reactions of 2 equiv of C4H3NH(2-(CH2NHBu)-Bu-t) and ZnR2 (R Me, Et) in toluene both produce [Zn {C4H3N(2-(CH2NHBu)-Bu-t)} 2] (3). Furthermore, while subjecting 2 equiv of C4H2NH(2-(CH2NHBu)-Bu-t) (5-CH2NMe2) with ZnMe2 in diethyl ether, affords [Zn{C4H2N(2-(CH2NHBu)-Bu-t)(5-CH2NMe2)} 2] (4) and additionally, reacting C4H2NH(2,5-(CH2NHBu)-Bu-t) 2 with ZnMe2 generates [Zn{C4H2N(2,5-(CH2NHBu)-Bu-t)(2)}(2)] (5) in satisfactory yield. All the aforementioned compounds were characterized by H-1 and C-13 NMR spectrometry and the molecular structures were determined by single crystal X-ray diffractometry. Compounds 1, 3, 4 and 5 are moderate catalysts for the ring-opening polymerization of e-caprolactone in toluene. (C) 2012 Elsevier B. V. All rights reserved.