排序方式: 共有55条查询结果,搜索用时 0 毫秒
1.
2.
Choudary BM Chowdari NS Jyothi K Kumar NS Kantam ML 《Chemical communications (Cambridge, England)》2002,(6):586-587
A new bifunctional catalyst consisting of active palladium and osmium species anchored on silica gel through a mercaptopropyl spacer and a cinchona alkaloid respectively has been prepared for the first time and used in the heterogeneous tandem Heck-asymmetric dihydroxylation of olefins to afford diols with excellent yields and enantiomeric excesses (ee's) in presence of N-methylmorpholine N-oxide or K3Fe(CN)6 as cooxidants. 相似文献
3.
A simple and convenient methodology for the synthesis of N,N′-disubstituted ureas from primary amines by a heterogenized catalyst montmorillonitebipyridinepalladium (II)acetate for the first time at room temperature and atmospheric pressure is described. 相似文献
4.
5.
Mannepalli L. Kantam Sutapa Ghosh Khathija Aziz B. Sreedhar Boyapati M. Choudary 《Journal of molecular catalysis. A, Chemical》2005,240(1-2):103-108
Heterogeneous nanoparticle NA-MgO-MAO/NA-TiO2 (anatase)-MAO supported bis (cyclopentadienyl) zirconium dichloride (Cp2ZrCl2) are synthesized and used for the polymerization of styrene monomer. The supporting process is confirmed via X-ray photoelectron spectroscopy (XPS) and FTIR. Characterization of the obtained polymer is done by gel permeation chromatography (GPC), 13C NMR spectroscopy and differential scanning calorimetry (DSC). 相似文献
6.
Andrei Tnsescu Marios O. Choudary Olivier Rioul Pantelimon George Popescu 《Entropy (Basel, Switzerland)》2021,23(11)
The bounds presented at CHES 2017 based on Massey’s guessing entropy represent the most scalable side-channel security evaluation method to date. In this paper, we present an improvement of this method, by determining the asymptotically optimal Massey-like inequality and then further refining it for finite support distributions. The impact of these results is highlighted for side-channel attack evaluations, demonstrating the improvements over the CHES 2017 bounds. 相似文献
7.
B.M. Choudary 《Polyhedron》1986,5(12):2117-2118
The epimerization of steroid alcohols is induced by the Pd(PPh3)4-p-benzoquinone system. A convenient method for the synthesis of epicholesterol is described. 相似文献
8.
9.
Different forms of extraframework ions present in faujasite zeolite prepared by Fe2+ ion exchange at different pH values and with subsequent reduction in hydrogen have been studied. “Low-coordination” Fetetr
2+ ions can be found either in the form of single ions accessible for chemisorption, or in the form of ion associations from
which centers of the catalytic processes can be formed in the CO+H2 reaction. “High-coordination” Feoct
2+ ions are not affected either by chemisorption or by CO+H2 treatment. 相似文献
10.