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。
Comparative study of ring-opening polymerization of <scp>l</scp>-lactide and ε-caprolactone using zirconium hexadentate bis(aminophenolate) complexes as catalysts
complexes as catalysts for the ring opening polymerization of L-lactide (LA) and ε-caprolactone (CL) were investigated. Ligands bearing various chelating groups have a profound influence on the catalysis results. Among them, the thiophen-2-yl methyl group showed the greatest activity while the pyridine-2-yl methyl group showed the worst performance with regard to the rate of CL polymerization. However
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。
FACILE AND CONVENIENT SYNTHESIS AND CHARACTERIZATION OF NOVEL SCHIFF BASES INVOLVING HETEROCYCLIC RING THROUGH ONE POT MULTICOMPONENT REACTIONS UNDER MILD CONDITIONS
作者:Hossein Naeimi、Khadigeh Rabiei
DOI:10.1515/hc.2008.14.4.257
日期:2008.1
A convenient and efficient procedure for one pot preparation of novel Schiff bases through threecomponent reactions of heterocyclic aldehyde, ammonium hydroxide and other aldehydes is described. Also, someconvenient and benefit Schiff bases have been prepared by two component reaction, from aldehyd and diamine. In this reaction, the desired products were easily obtained in excellent yields and in
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)