排序方式: 共有23条查询结果,搜索用时 24 毫秒
1.
Yarabally R Girish Kanchipura R Raghavendra Dasappa Nagaraja Kothanahally S Sharath Kumar Sheena Shashikanth 《中国化学》2015,33(2):181-184
An efficient, inexpensive and simple method for the reduction of various α,β‐unsaturated ketones to corresponding saturated ketones using tosyl hydrazide as a hydrogen donor in DMF using calcium oxide powder has been reported. A variety of enones underwent reduction without forming undesirable side products. High chemoselectivity, broad functional group tolerance and good yields are the noteworthy features of this protocol. 相似文献
2.
A simple versatile method for the conversion of 1 -aroyl-2-(substituted benzylidene)-hydrazines to 1-aryl-phthalazines using polyphosphate ester (PPE) is described. 相似文献
3.
Banavara N. Shashikanth Artan Sheshmani Scott David Kelly Mingjun Wei 《Journal of Mathematical Fluid Mechanics》2010,12(3):335-353
In a previous paper, we presented a (noncanonical) Hamiltonian model for the dynamic interaction of a neutrally buoyant rigid
body of arbitrary smooth shape with N closed vortex filaments of arbitrary smooth shape, modeled as curves, in an infinite ideal fluid in
\mathbbR3\mathbb{R}^3. The setting of that paper was quite general, and the model abstract enough to make explicit conclusions regarding the dynamic
behavior of such systems difficult to draw. In the present paper, we examine a restricted class of such systems for which
the governing equations can be realized concretely and the dynamics examined computationally. We focus, in particular, on
the case in which the body is a smooth sphere. The equations of motion and Hamiltonian structure of this dynamic system, which
follow from the general model, are presented. Following this, we impose the constraint of axisymmetry on the entire system
and look at the case in which the rings are all circles perpendicular to a common axis of symmetry passing through the center
of the sphere. This axisymmetric model, in our idealized framework, is governed by ordinary differential equations and is,
relatively speaking, easily integrated numerically. Finally, we present some plots of dynamic orbits of the axisymmetric system. 相似文献
4.
5.
Biswanath Das Kongara Damodar Nisith Bhunia Boddu Shashikanth 《Tetrahedron letters》2009,50(18):2072-5609
Appel agents (PPh3/CBr4) have been utilized for high-yielding stereoselective synthesis of (Z)- and (E)-allyl bromides from Baylis-Hillman adducts at room temperature. The method has been applied for the synthesis of naturally occurring bioactive fatty acid amides, semiplenamides C and E. 相似文献
6.
Powder XRD data of mixtures of title compounds are interpreted in terms of superlattices (SL). It is suggested that SL configurations
(orthorhombic-orthorhombic, orthorhombic-monoclinic, monoclinic-monoclinic) are realizable, because of discrete orientational
changes in the alignment of molecules of n-C28H58 hydrocarbon, through an angle mθ, wherem = 1, 2, 3 … and angle θ has an average value of 3.3°. Supporting literature evidence on the inclinations are discussed. 相似文献
7.
Shashikanth Ponnala Devi Prasad Sahu Rishi Kumar Prakas R. Maulik 《Journal of heterocyclic chemistry》2006,43(6):1635-1640
A series of novel dispiro[oxindole‐thiazolidinedione]pyrrolidine, dispiro[oxindole‐thioxothiazolidinone]‐pyrrolidine, dispiro[oxindole‐dihydro‐pyrazolone]pyrrolidine were synthesized by both regio‐ and stereo‐selective 1,3‐dipolar cycloaddition reaction of azomethine ylide generated from amino acid and amino acid ester with π‐deficient alkenes in a single pot protocol in good yield. X‐ ray crystallographic studies established orthogonal disposition between spiro‐oxindole and spiro‐thiazolidinedione rings in 4a and 5a . 相似文献
8.
Mahendra Madegowda Doreswamy Beeranahally H. Sridhar Mandayam A. Prasad Javaregowda S. Khanum Shaukath A. Shashikanth Sheena Sudha Belagur S. 《Structural chemistry》2004,15(3):211-214
Benzophenone analog 3 has been synthesized and characterized by the X-ray diffraction (XRD) method. The compound crystallizes in a monoclinic space group P21/c with cell parameters a = 7.701(8) Å, b = 7.151(5) Å, c= 28.323(3) Å, = 104.639(4)°, Z = 4. The structure exhibits intra- and intermolecular hydrogen bonding of the type N–HO, C–HO, and N–HN. The molecules are interlinked through hydrogen bonds forming an infinite chain. This polymeric-like structure may play an important role in biological activity. 相似文献
9.
Synthesis and Crystal Structure of [2-(4-chlorobenzoyloxy)-5-methylphenyl]-(4-methylphenyl)methanone
S. Naveen T. D. Venu S. Shashikanth M. A. Sridhar J. Shashidhara Prasad 《Journal of chemical crystallography》2007,37(12):787-791
[2-(4-Chlorobenzoyloxy)-5-methylphenyl]-(4-methylphenyl)methanone was synthesized and characterized by spectroscopic and X-ray diffraction methods. The molecule crystallizes in the monoclinic space group P21/c with cell parameters a = 13.7530(19) Å, b = 10.0560(19) Å, c = 13.469(3) Å, β = 100.630(7)° and Z = 4. There is a large discrepancy between the carbonyl group bond lengths of ketone and the ester. The structure exhibits intermolecular hydrogen bonds of the type C–H···O. 相似文献
10.
Biswanath Das Gandham Satyalakshmi Kanaparthy Suneel Boddu Shashikanth 《Tetrahedron letters》2008,49(50):7209-7212
Three-component reactions of nitroarenes, benzaldehydes, and allyltributylstannane using indium in dilute aqueous HCl at room temperature afford the corresponding homoallylic amines in high yields within 5-10 min. The conversion in one-pot synthesis involves the following steps: (i) reduction of nitro compounds to amines, (ii) formation of imines from amines and aldehydes, and (iii) allylation of imines. 相似文献