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An Unusual Ring‐Contraction/Rearrangement Sequence for Making Functionalized Di‐ and Triquinanes 下载免费PDF全文
Chinta Nagaraju Prof. Dr. Kavirayani R. Prasad 《Angewandte Chemie (International ed. in English)》2014,53(41):10997-11000
A novel ring contraction/rearrangement sequence leading to functionalized 2,8‐oxymethano‐bridged di‐ and triquinane compounds is observed in the reaction of various substituted 1‐methyl‐4‐isopropenyl‐6‐oxabicylo[3.2.1]octan‐8‐ones with Lewis acids. The reaction is novel and is unprecedented for the synthesis of di‐ and triquinane frameworks. 相似文献
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Vasant R Choudhary Chinta Sivadinarayana Kshudiram Mantri 《Journal of Chemical Sciences》1999,111(5):669-676
The acidity and initial and time-on-stream activity in propane aromatization (at 550°C, space velocity of 3100 cm3g−1
(zeolite)h−1) of Ga-impregnated H-ZSM-5 zeolite without or with binders (50 wt%), such as silica, alumina and kaolin, have been investigated.
Both the acidity and catalytic activity of the zeolite are influenced by the presence of binder in the catalyst, depending
upon the binder. The influence is found to be lowest for alumina and highest for kaolin. Among the binders, alumina is the
most preferred binder for the zeolite catalyst. 相似文献
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We construct multiple Dirichlet series in several complex variables whose coefficients involve quadratic residue symbols.
The series are shown to have an analytic continuation and satisfy a certain group of functional equations. These are the first
examples of an infinite collection of unstable Weyl group multiple Dirichlet series in greater than two variables having the properties predicted in [2]. 相似文献
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Choudary BM Reddy CR Prakash BV Kantam ML Sreedhar B 《Chemical communications (Cambridge, England)》2003,(6):754-755
Osmate-exchanged Mg-Al layered double hydroxides catalysed the delivery of two oxygen atoms simultaneously via a 3 + 1 cycloaddition to sulfide to form sulfone directly for the first time, reminiscent of 3 + 2 cycloaddition in asymmetric dihydroxylation reactions. 相似文献
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Let E be an imaginary quadratic extension of of class number one. We examine certain representation numbers associated to Hermitian forms over E , which involve counting integral points on flag varieties.
G. Chinta is partially supported by the NSF and by a Humboldt Research Fellowship. 相似文献
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A calix[4]arene conjugate bearing salicylyl imine having dibenzyl moiety (L) has been synthesized and characterized, and its ability to recognize three most important essential elements of human system, viz., iron, copper, and zinc, has been addressed by colorimetry and fluorescence techniques. L acts as a sensor for Cu(2+) and Fe(2+) by exhibiting visual color change and for Zn(2+) based on fluorescence spectroscopy. L shows a minimum detection limit of 3.96 ± 0.42 and 4.51 ± 0.53 ppm and 45 ± 4 ppb, respectively, toward Fe(2+), Cu(2+), and Zn(2+). The in situ prepared [ZnL] exhibits phosphate sensing among 14 anions studied with a detection limit of 247 ± 25 ppb. The complexes of Zn(2+), Cu(2+), and Fe(2+) of L have been synthesized and characterized by different techniques. The crystalline nature of the zinc and copper complexes and the noncrystalline nature of simple L and its iron complex have been demonstrated by powder XRD. The structures of Cu(2+) and Zn(2+) complexes have been established by single crystal XRD wherein these were found to be 1:1 monomeric and 2:2 dimeric, respectively, using N(2)O(2) as binding core. The geometries exhibited by the Zn(2+) and the Cu(2+) complexes were found to be distorted tetrahedral and distorted square planar, respectively. The iron complex of L exists in 1:1 stoichiometry as evident from the mass spectrometry and elemental analysis. 相似文献