排序方式: 共有18条查询结果,搜索用时 8 毫秒
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Krishna Sai Gajula Naresh Mameda Srujana Kodumuri Durgaiah Chevella Rammurthy Banothu Vasu Amrutham 《合成通讯》2013,43(22):2866-2876
The synthesis of 2,3-dihydroquinazolin-4(1H)-ones by cyclocondensation of anthranilamide with ketones in aqueous media using Hβ zeolite is reported. The scope of the reaction was explored by various ketones such as aromatic, aliphatic and cyclic ketones. Based on the preliminary mechanistic results, a tentative mechanism for the formation of 2,3-dihydroquinazolin-4(1H)-ones using zeolite catalyst (Hβ) is predicted. The reusability study, large-scale experiment and water as solvent showed significant benefits of this catalytic protocol in comparing to earlier methods. 相似文献
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Sridhar Madabhushi Raveendra JillellaKondal Reddy Godala Kishore Kumar Reddy MalluChina Ramanaiah Beeram Narsaiah Chinthala 《Tetrahedron letters》2012,53(39):5275-5279
An efficient and simple method for the synthesis of 2,2-disubstituted-2H-chromenes by one-step cyclocondensation of a phenol with a variety of 1,1-disubstituted propargyl alcohols using BF3·Et2O as the catalyst is described. 相似文献
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Abstract: This review covers the results of metal determinations using various spectrochemical analytical techniques in crocodilians from various geographical regions. The most widely determined metal is mercury, both inorganic and organic. However, many other metals, including the known toxic metals of lead and cadmium, have been determined. In general, more elevated levels of metals have been determined in crocodilians from potentially contaminated as opposed to more pristine areas. Significant differences in concentrations for many metals have been demonstrated in captive versus wild alligators. The part of crocodilians most widely utilized for food, tail or tail meat, has attracted the most interest, but studies on kidney and liver as well as blood have been reported. Eggs and hatchings have also been examined for several metal concentrations. 相似文献
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Chevella Durgaiah Mameda Naresh Macharla Arun Kumar Peraka Swamy Marri Mahender Reddy Kodumuri Srujana 《合成通讯》2016,46(13):1133-1144
A simple, efficient, and environmentally benign protocol for the synthesis of vicinal iodohydrins and iodoesters from olefins using NH4I and Oxone in CH3CN/H2O (1:1) and dimethylformamide (DMF) / dimethylacetamide (DMA), respectively, without employing a catalyst at room temperature is described. Regio- and stereoselective iodohydroxylation and iodoesterification of various olefins with anti fashion, following Markonikov’s rule, was achieved and the corresponding products were obtained in good to excellent yields. In addition, 1,2-disubstituted olefins afforded excellent diastereoselectivity. 相似文献
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Sridhar Madabhushi Narsaiah ChinthalaVenkata Sairam Vangipuram Kondal Reddy GodalaRaveendra Jillella Kishore Kumar Reddy MalluChina Ramanaiah Beeram 《Tetrahedron letters》2011,52(46):6103-6107
Efficient one-step method for the synthesis of amides directly from ketones and benzoxazoles from (2-hydroxyaryl) ketones by the reaction of acetohydroxamic acid using sulfuric acid as catalyst was described. 相似文献
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Extensively Reversible Thermal Transformations of a Bistable,Fluorescence‐Switchable Molecular Solid: Entry into Functional Molecular Phase‐Change Materials 下载免费PDF全文
P. Srujana Prof. T. P. Radhakrishnan 《Angewandte Chemie (International ed. in English)》2015,54(25):7270-7274
Functional phase‐change materials (PCMs) are conspicuously absent among molecular materials in which the various attributes of inorganic solids have been realized. While organic PCMs are primarily limited to thermal storage systems, the amorphous–crystalline transformation of materials like Ge‐Sb‐Te find use in advanced applications such as information storage. Reversible amorphous–crystalline transformations in molecular solids require a subtle balance between robust supramolecular assembly and flexible structural elements. We report novel diaminodicyanoquinodimethanes that achieve this transformation by interlinked helical assemblies coupled with conformationally flexible alkoxyalkyl chains. They exhibit highly reversible thermal transformations between bistable (crystalline/amorphous) forms, along with a prominent switching of the fluorescence emission energy and intensity. 相似文献
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Sridhar Madabhushi Kondal Reddy GodalaChina Ramanaiah Beeram Narsaiah Chinthala 《Tetrahedron letters》2012,53(41):5539-5540
An efficient stereoselective total synthesis of botryolide-E by a chiral-pool approach is described. 相似文献
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Madabhushi Sridhar Chinthala NarsaiahJillella Raveendra Godala Kondal ReddyMallu Kishore Kumar Reddy Beeram China Ramanaiah 《Tetrahedron letters》2011,52(36):4701-4704
An efficient synthesis of oximes by reaction of carbonyls with acetohydroxamic acid using BF3·OEt2 as a catalyst is described. 相似文献