【摘 要】
：
2-Amino-2-chromenes are class of heterocycles that posses considerable interest as pigments, cosmetics, potential agro-chemicals and being the main constituents
【机 构】
：
Chemistry Department
论文部分内容阅读
2-Amino-2-chromenes are class of heterocycles that posses considerable interest as pigments, cosmetics, potential agro-chemicals and being the main constituents of many natural products. Although, they are generally prepared either under conventional heating, benign reagents or very recently, a three component condensation in poly-ethylene glycol-water in the presence of nanosized magnesium oxide, most of these methods require prolonged reaction time, reagents in stoichiometric amounts and generate moderate yields of products. Microwave technique performs a better yield in a short reaction time (85-94%;5-8 rain). Also, three-component one step reaction is of great interest for cost savings from the point of raw materials, energy and time. A combination between both techniques will be attractive for researchers in that field.
其他文献
In this paper, we present a hybrid representation of image-based models combining the textured planes and the hierarchical points. Taking a set of depth images
A titanocene-ferrocenyl complex, (5-ferrocenyl-2-hydroxybenzenecarboxylato-O,O)-bis(methylcyclopentadienyl)titanium(Ⅳ) 4, and an unexpected ionic complex, [C7H
The mechanism of mine water inrushes in coal mines in China differs considerably from that in other countries. In China, most water inrushes occur from floor st
Fischer indole cyclization of phenylhydrazine and various ketones using carboxyl-functionalized ionic liquid, 1-carboxymethyl-3-methylimidazolium tetrafluorobor
A novel organic-inorganic hybrid compound, [Pb2I4(bipy)]n (bipy = 4,4-bipyridine),was synthesized by self-assembly and its structure was determined by X-ray cry
Development of highly effective catalysts for one-stage conversion of methane with high selectivity to valuable products and energy efficiency will provide an e
With the increase in mining depth, the danger of coal and gas outbursts increases. In order to drain coal gas effectively and to eliminate the risk of coal and
In-situ DRIFTS was used to study the deep oxidation of propane,a side reaction during propane oxidative dehydrogenation to propene. Strong adsorption of propene
This paper presents a new joint optimization method for the design of sharp linear-phase finite-impulse response (FIR) digital filters which are synthesized by
Physical mechanisms and influencing factors on the effective stress coeffcient for rock/soil-like porous materials are investigated,based on which equivalent co