【摘 要】
：
Keggin type heteropolyacids was found to be an efficient and reusable catalyst for the synthesis of biologically active quinoxaline derivatives from the condens
【出 处】
：
Chinese Chemical Letters
论文部分内容阅读
Keggin type heteropolyacids was found to be an efficient and reusable catalyst for the synthesis of biologically active quinoxaline derivatives from the condensation of 1,2-diamine with 1,2-dicarbonyl compounds in excellent yields in water.This method provides a new and efficient protocol in terms of small quantity of catalyst,a wide scope of substrates,and simple work-up procedure.
Keggin type heteropolyacids was found to be an efficient and reusable catalyst for the synthesis of biologically active quinoxaline derivatives from the condensation of 1,2-diamine with 1,2-dicarbonyl compounds in excellent yields in water. This method provides a new and efficient protocol in terms of small quantity of catalyst, a wide scope of substrates, and simple work-up procedure.
其他文献
After the integration for Baosteel Group Corporation,stainless steel is being rapidly developed and is becoming one of Baosteel’s strategic products.Since stai
省十一届人大二次会议,共收到代表提交的议案8件,建议663件。代表们怀着对广东人民的忠诚,对广东发展的信心,站在时代的高度,从科学发展观的视角,谋划落实《珠江三角洲地区改
生于六十年代在以张艺谋、冯小刚为首的第五代导演“一手遮天”下,60年代出生的导演从来没有停止“蠢蠢欲动”。王全安、张扬、张元的新作日前都浮出水面。这一次,他们的转型
昭乌达盟北部嘎斯汰河北岸的土庙子大队,是林西县的万亩林大队,其中土庙子八队尤为突出。每当生长季节,一踏进该队的地界,高大挺拔的杨树和整齐的农田防护林带就展现在人们
本文对Ku频段GaAs-FET低噪声放大器的设计调试作了介绍,并对研制的Ku频段低噪声放大器的性能、结构和使用情况作了简单说明。
This article introduces the design and debu
The DOS, JDOS and ε2(Ω) of monolayer superlattice Ga0.47ln0.53As/ InP(110) have been calculated by a tight-binding approach and compared with that of alloy Ga
由中华医学会中华耳鼻咽喉头颈外科杂志编委会和中华耳鼻咽喉科学分会联合举办的全国鼻科中青年专家论坛,于2005年4月23—25日在风景秀丽的广西北海市举行,开幕式由中华医学
营销大师阿尔·里斯断言,广告是品牌维护,公关是品牌塑造。在中国,上海通用雪佛兰展开一路公关,用爱心与责任一年成就了“新”品牌——雪佛兰。
Aristotle marketing master
根据森林永续利用及合理利用的原则,在解决原木的综合加工问题中,高等林业技术院校的学者们作出了巨大的贡献。十六所学院,2,000多名科学教育工作者(其中有博士和后补博士80
通过观测MOS电容由深耗尽到反型层的形成过程,可以测量少数载流子的寿命.其方法就是在MOS电容的栅极上加上足能使表面反型的阶梯电压.起初,多数载流子在半导体表面处于非平衡