排序方式: 共有38条查询结果,搜索用时 328 毫秒
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A. B. Crosby R. J. Magee M. J. OConnor K. N. Tantry C. N. R. Rao 《Journal of Chemical Sciences》1979,88(6):393-399
The nature of coordination in metal monothiocarbamates is shown to depend on the hardness or softness of the metal ton. Thus,
the monothiocarbamate ion acts as a monodentate ligand with metal-sulphur bending when the metal ion is a soft acid while
it acts as a bidentate ligand when the metal ion is a hard acid; it can exhibit either behaviour when the metal ion is a borderline
acid. In dialkyltin and dialkylmonocholorotin complexes, the monothiocarbamate ion acts as a bidentate ligand with strong
Sn-S bonding while in trialkyl-or triaryl-tin complexes it acts essentially as a monodentate ligand. Thus, R3Sn(I) seems to be a soft or borderline acid while R2Sn(II) is a hard acid. 相似文献
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The synthesis of orthogonally protected Fmoc‐Dap/Dab (Boc/Z/Alloc)‐OH starting from Fmoc‐Asp/Glu has been described. The salient features of our synthetic strategy involved formation of Fmoc‐Asp/Glu‐5‐oxazolidinone acids, conversion of acid function to acyl azides, Curtius rearrangement, and hydrolysis of the oxazolidinone group. 相似文献
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SJ Rose 《Contemporary Physics》2013,54(2):109-121
In this paper we describe experiments conducted with high-power lasers that are attempting to replicate, for a very short time and in miniature, conditions found in the Sun. Experiments to date have reached conditions in the outer part of the Sun. To reach the Sun's centre requires compression of material to very much greater than solid density and heating to over ten million degrees. To achieve this, a new class of experiments and a new generation of high-power lasers are required. 相似文献
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Electronic absorption spectra of a variety of thiocarbonyl and selenocarbonyl compounds have been compared to point out their
similarities. Interesting correlations between the absorption maxima and electronegativities of substituents in both the seleno-
and thio-carbonyl compounds have been reported. 相似文献
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Shameem Shameem A. Banday Abid H. Khan Khaliquz Zaman Tantry Mudasir A. Ganai Bashir A. 《Chemistry of Natural Compounds》2022,58(1):71-74
Chemistry of Natural Compounds - A new 9,19-cyclolanostane type arabinoside, 16,23;22,25-diepoxy-3β,22,23,24-tetrahydroxy-9,19-cyclolanostane-3-O-α-L-arabinopyranoside (1), together with... 相似文献
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Mudasir Ahmad Tantry Reehana Khan Seema Akbar Abdul Sami Shawl Mohammed Khalid Siddiqui 《中国化学快报》2010,21(3):332-336
<正>A unusual flavone glycoside named Shamimarin(1) and a new compound Acetoxy-8-methyl-chromen-2H-one(2) were isolated from aerial parts of Rhododendron lepidotum L.along with four known coumarins daphnin(3),daphnetin 8-O-β-D-glucopyrano-side (4),daphnetin(5) and umbelliferone(6).The structural elucidations were based on analyses of chemical and spectroscopic data by including ID and 2D NMR analyses. 相似文献
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