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 ZnR 2 with 1 equiv of C 4 H 3 NH(2-CH 2 NH t Bu) in diethyl ether yields [Zn{C 4 H 3 N(2-CH 2 NH t Bu)}R] (1, R = Me; 2, R = Et) in high yield. Similarly, the reactions of 2 equiv of C 4 H 3 NH(2-CH 2 NH t Bu) and ZnR 2 (R = Me, Et) in toluene both produce [Zn{C 4 H 3 N(2-CH 2 NH t Bu)} 2 ] (3). Furthermore, while subjecting 2 equiv of C 4 H 2 NH(2-CH 2 NH t Bu)(5-CH 2 NMe 2 ) with ZnMe 2 in diethyl ether, affords [Zn{C 4 H 2 N(2-CH 2 NH t Bu)(5-CH 2 NMe 2 )} 2 ] (4) and additionally, reacting C 4 H 2 NH(2,5-CH 2 NH t Bu) 2 with ZnMe 2 generates [Zn{C 4 H 2 N(2,5-CH 2 NH t Bu) 2 } 2 ] (5) in satisfactory yield. All the aforementioned compounds were characterized by 1 H and 13 C 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 ε-caprolactone in toluene. © 2012 Elsevier B.V. All rights reserved.