研究了一系列的双(氨基酚酸)锆配合物,用于L-丙交酯(LA)和ε-己内酯(CL)的开环聚合。带有各种螯合基团的配体对催化结果有深远的影响。其中,就CL聚合速度而言,噻吩-2-基甲基表现出最大的活性,而吡啶-2-基甲基表现出最差的性能。然而,LA聚合速率的趋势相反。动力学结果表明对[CL]和[LA]具有一阶依赖性。但是,催化剂浓度的顺序不同。聚合反应依赖于[ L OMe Zr(OBn)2CL的],但对LA的[ L OMe Zr(OBn)2 ]具有一阶依赖性。
作者:A. D. Elchueva、N. V. Aristova、I. V. Bortnikov、A. A. Tabachkov
DOI:10.1023/a:1012725924899
日期:——
Single-component urethane sealing formulations with aldimines as cross-linking agents were developed. The temperature dependence of the curing tirne of the sealants was examined. The influence of -CH=N-/-NCO ratio and of fillers (industrial carbon and chalk) on their physicochemical properties was studied.
Shukla; Misra; Pathak, Journal of the Indian Chemical Society, 1990, vol. 67, # 8, p. 678 - 679
作者:Shukla、Misra、Pathak、Narain
DOI:——
日期:——
A zeolite promoted expeditious one-pot synthesis of 1-arylmethyl-4,5-dihydro-2-aryl-1H-imidazole
作者:Ramakanth Pagadala、Jyotsna S. Meshram、Himani N. Chopde、Nagender Reddy Panyala
DOI:10.1002/jhet.314
日期:——
Abstractmagnified image A series of 1‐arylmethyl‐4,5‐dihydro‐2‐aryl‐1H‐imidazoles were synthesized expeditiously in good yields from 1,2‐diaminoethane and aromatic aldehydes in the presence of zeolite under microwave irradiation in the absence of solvent. The resulting substituted imidazoles are characterized by 1H and 13C NMR, elemental analysis, and mass spectral data. J. Heterocyclic Chem., (2010)
A new unsymmetrical bis-furan pendant-armed macrocyclic heterodinuclear Cu(II)Zn(II) complex, [CuZnL(OAc)](ClO4)center dot 3MeCN center dot H2O(1) (H2L was derived from the condensation between 1,6-bis(2-furyl)-2,5-bis(2-hydroxy-3-formyl-5-bromobenzyl)-2,5-diazahexane and 1,3-diaminopropane), has been synthesized and characterized by EDS (energy dispersive spectroscopy) and X-ray crystallography determination. The interaction between the complex and calf thymus (CT) DNA was investigated by UV-vis absorption, viscosity experiment, fluorescent and CD spectroscopy. The mechanism of the cleavage of supercoiled DNA (pBR 322DNA) process was also studied. It is proposed that DNA cleavage promoted by the complex occurrence via oxidative mechanism. (C) 2010 Elsevier B.V. All rights reserved.