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排序方式: 共有76条查询结果,搜索用时 156 毫秒
31.
Harmata M Zheng P Huang C Gomes MG Ying W Rayanil KO Ranyanil KO Balan G Calkins NL 《The Journal of organic chemistry》2007,72(2):683-685
Sulfinamides were synthesized from sulfonyl chlorides using a procedure involving in situ reduction of sulfonyl chlorides. The reaction is broad in scope and easy to perform. 相似文献
32.
Susanta K. Borthakur Lakhya J. Konwar Gayatri Nath Pabitra K. Kalita Sukanya Borthakur 《Journal of heterocyclic chemistry》2020,57(12):4210-4214
Synthesis of a new series of novel [1,3,4]thiadiazolo[3,2-c][1,3,5]thiadiazine-6,6-dioxide by [4 + 2] cycloaddition reaction of 3-benzylidineamino[1,3,4]thiadiazole with sulfene generated in situ from methanesulfonyl chloride in the presence of triethylamine is described. The novel compounds thus synthesized were screened for their antifungal activity against two fungal species, namely Rhizoctonia solani and Dreschslera oryzae. Carbendazim was the standard used for the evaluation of antifungal activity. 相似文献
33.
Vidadala SR Gayatri G Sastry GN Hotha S 《Chemical communications (Cambridge, England)》2011,47(35):9906-9908
Transfuranosylations are not well studied though many similar studies exist for transpyranosylation; herein, we report that propargyl/methyl D-ribf- and D-lyxf- give only 1,2-trans glycosides whereas D-araf- and D-xylf- result in a mixture of 1,2-trans and 1,2-cis glycosides; observed facts are rationalised by computational studies. 相似文献
34.
Complementary α-alkylation approaches for a sterically hindered spiro[pyrazolopyranpiperidine]ketone
Chris Limberakis Jianke Li Gayatri Balan David A. Griffith Daniel W. Kung Colin Rose Derek Vrieze 《Tetrahedron letters》2012,53(20):2543-2547
Complementary α-alkylation methods are used to derivatize a sterically hindered spiro[pyrazolopyranpiperidine]ketone. More specifically, enolate alkylations in the presence of DMPU and aldol condensations are employed to deliver these compounds. 相似文献
35.
Georgiy Akopov Nethmi W. Hewage Philip Yox Gayatri Viswanathan Shannon J. Lee Liam P. Hulsebosch Sarah D. Cady Alexander L. Paterson Frdric A. Perras Wenqian Xu Kui Wu Yaroslav Mudryk Kirill Kovnir 《Chemical science》2021,12(44):14718
An innovative method of synthesis is reported for the large and diverse (RE)6(TM)x(Tt)2S14 (RE = rare-earth, TM = transition metals, Tt = Si, Ge, and Sn) family of compounds (∼1000 members, ∼325 contain Si), crystallizing in the noncentrosymmetric, chiral, and polar P63 space group. Traditional synthesis of such phases involves the annealing of elements or binary sulfides at elevated temperatures. The atomic mixing of refractory components technique, presented here, allows the synthesis of known members and vastly expands the family to nearly the entire transition metal block, including 3d, 4d, and 5d TMs with oxidation states ranging from 1+ to 4+. Arc-melting of the RE, TM, and tetrel elements of choice forms an atomically-mixed precursor, which readily reacts with sulfur providing bulk powders and large single crystals of the target quaternary sulfides. Detailed in situ and ex situ experiments show the mechanism of formation, which involves multiphase binary sulfide intermediates. Crystal structures and metal oxidation states were corroborated by a combination of single crystal X-ray diffraction, elemental analysis, EPR, NMR, and SQUID magnetometry. The potential of La6(TM)x(Tt)2S14 compounds for non-linear optical applications was also demonstrated.Synthesis from atomically-mixed precursors opens up a phase space to hundreds of chiral and polar sulfide semiconductors with almost any transition metal in variable oxidation states. 相似文献
36.
37.
Gayatri G Soujanya Y Fernández I Frenking G Sastry GN 《The journal of physical chemistry. A》2008,112(50):12919-12924
The computational study explores the electronic fine tuning of the exocyclic C-C single bond length in tetrahedranyl tetrahedrane as a function of various substituents. The factors which determine the bond lengths and bond strengths are examined by using the EDA method. 相似文献
38.
39.
Paul S. Humphries Gayatri Balan Bruce M. Bechle Edward L. Conn Kenneth J. Dirico Yu Hui Robert M. Oliver James A. Southers Xiaojing Yang 《Tetrahedron letters》2009,50(18):2140-806
We have developed a number of efficient protocols for the facile synthesis of 1,2,3,4-tetrahydroisoquinolin-1-ones. This synthetic methodology allowed concise and efficient exploration of the SAR in all areas of the molecule. A number of these methods proved to be versatile, efficient and amenable to parallel synthesis. 相似文献
40.
Various types of stilbenophanes, indolophanes and bisindolostilbenophanes were synthesized by intra-, inter- and tandem intra-, intermolecular McMurry coupling. Some of the indolophanes and bisindolostilbenophanes exhibited significant activity against the growth of various bacteria. Complexation of some of the cyclophanes with TCNQ has also been studied. 相似文献