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1.
Jangam Sampada S. Wankhede Sagar B. Chitlange Sohan S. 《Research on Chemical Intermediates》2019,45(2):471-486
Research on Chemical Intermediates - As the therapeutic potential of quinazolinone and thiazolidinone is well mentioned in literature for their versatile biological activities, their related... 相似文献
2.
Sagar E. Shirsath B.G. Toksha S.M. Patange Ganesh S. Jangam 《Journal of Physics and Chemistry of Solids》2010,71(12):1669-1675
The ferrite samples of a chemical formula Ni0.5−xMnxZn0.5Fe2O4 (where x=0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) were synthesized by sol-gel auto-combustion method. The synthesized samples were annealed at 600 °C for 4 h. An analysis of X-ray diffraction patterns reveals the formation of single phase cubic spinel structure. The lattice parameter increases linearly with increase in Mn content x. An initial increase followed by a subsequent decrease in saturation magnetization with increase in Mn content is observed showing inverse trend of coercivity (Hc). Curie temperature decreases with increase in Mn content x. The initial permeability is observed to increase with increase in Mn content up to x=0.3 followed by a decrease, the maximum value being 362. Possible explanation for the observed structural, magnetic, and changes of permeability behavior with various Mn content are discussed. 相似文献
3.
Rama Moorhy Appa S. Siva Prasad Jangam Lakshmidevi Bandameeda Ramesh Naidu Manchala Narasimhulu Katta Venkateswarlu 《应用有机金属化学》2019,33(10)
An agro waste‐derived, ‘water extract of pomegranate ash’ (WEPA), has been utilized for the first time as a renewable medium for Pd(OAc)2‐catalysed Suzuki–Miyaura cross‐coupling at room temperature. This method offers a simple and sustainable synthesis of biaryls from aryl halides and arylboronic acids under ligand‐ and external base‐free aerobic and ambient conditions. This method has been found effective for both activated and unactivated aryl halides in the production of biaryls with moderate to nearly quantitative yields. The protocol shows high chemoselectivity over identical/similar reactive sites in aryl halides (i.e. selectivity over identical halogens or different halogens of aryl halides). This method exhibits high regioselectivity, i.e. the selective reactivity of a halogen over other identical halogens at different positions on the aromatic nucleus. Therefore, we disclose here a clean, benign, substantial chemo‐ and regioselective and highly economic alternative method for the palladium‐assisted synthesis of biaryls using an agro waste‐derived medium. 相似文献
4.
Russian Journal of General Chemistry - A series of new 3-(2-substituted)-4-(oxothiazolidin-3-yl)-2-methylquinazolin-4(3H)-ones 1a–1k is synthesized by using the hybridization approach via one... 相似文献
5.
Sana Siva Prasad Bandameeda Ramesh Naidu Marlia M. Hanafiah Jangam Lakshmidevi Ravi Kumar Marella Sivarama Krishna Lakkaboyana Katta Venkateswarlu 《Molecules (Basel, Switzerland)》2021,26(17)
Metalloporphyrins (and porphyrins) are well known as pigments of life in nature, since representatives of this group include chlorophylls (Mg-porphyrins) and heme (Fe-porphyrins). Hence, the construction of chemistry based on these substances can be based on the imitation of biological systems. Inspired by nature, in this article we present the preparation of five different porphyrin, meso-tetraphenylporphyrin (TPP), meso-tetra(p-anisyl)porphyrin (TpAP), tetrasodium meso-tetra(p-sulfonatophenyl)porphyrin (TSTpSPP), meso-tetra(m-hydroxyphenyl)porphyrin (TmHPP), and meso-tetra(m-carboxyphenyl)porphyrin (TmCPP) as well as their N-pincer Pd(II)-complexes such as Pd(II)-meso-tetraphenylporphyrin (PdTPP), Pd(II)-meso-tetra(p-anisyl)porphyrin (PdTpAP), Pd(II)-tetrasodium meso-tetra(p-sulfonatophenyl)porphyrin (PdTSTpSPP), Pd(II)-meso-tetra(m-hydroxyphenyl)porphyrin (PdTmHPP), and Pd(II)-meso-tetra(m-carboxyphenyl)porphyrin (PdTmCPP). These porphyrin N-pincer Pd(II)-complexes were studied and found to be effective in the base-free self-coupling reactions of potassium aryltrifluoroborates (PATFBs) in water at ambient conditions. The catalysts and the products (symmetrical biaryls) were characterized using their spectral data. The high yields of the biaryls, the bio-mimicking conditions, good substrate feasibility, evading the use of base, easy preparation and handling of catalysts, and the application of aqueous media, all make this protocol very attractive from a sustainability and cost-effective standpoint. 相似文献
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7.
Now-a-days, catalytic decomposition of methane (CDM) into hydrogen and carbon is a promising technique for production of fuel
cell grade hydrogen. The Ni based catalysts seems promising particularly for the production of COx free H2 by methane decomposition process. The CDM activity and longevity of the Ni based catalysts are mainly influenced by the amount
of Ni and type of support material. In this paper the CDM activity results are correlated with NiO crystallite size, Ni metal
surface area and acidity of the catalysts. In case of bimetallic catalysts addition of Cu to Ni catalysts lead to enhance
the CDM activity at higher temperature thus resulting in the increased concentration of hydrogen in the outlet stream. Finally,
some of the carbon-based catalysts are studied for methane decomposition activity at higher temperature. The surface changes
over carbon catalysts with methane decomposition are studied using various characterization techniques. 相似文献
8.
O. Manuel C. Bolon Prashanth Jangam 《Journal of Radioanalytical and Nuclear Chemistry》2002,251(3):417-422
The nuclear energy surface is presented as three-dimensional (3-D) plots of mass or atomic number versus charge density versus average energy per nucleon. These plots reveal a trough or cradle of the nuclides. Stable and long-lived nuclides are located in the valley. Those that are radioactive or are easily destroyed by fusion or fission occupy higher positions. Separate modes of nucleosynthesis fill the cradle from different directions and produce distinct occupancy levels, i.e., different abundance patterns. The cradle can be used to estimate the properties of nuclear matter that cannot be studied in the laboratory. 相似文献
9.
Catalytic decomposition of CH4 over Ni-Al2O3-SiO2 catalysts: Influence of pretreatment conditions for the production of H2
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Jangam Ashok Gangadhara Raju Padigapati Shiva Reddy Machiraju Subrahmanyam Akula Venugopal 《天然气化学杂志》2008,17(2):113-119
This article reports the production of COx free hydrogen and carbon nanofibers by the catalytic decomposition of methane over Ni-Al2O3-SiO2 catalysts. The influence of reaction temperature, pretreatment temperature, and effect of reductive pretreatment on the decomposition of methane activity is investigated. The physico-chemical characteristics of fresh and deactivated samples were characterized using BET-SA, XRD, TPR, SEM/TEM, CHNS analyses and correlated with the methane decomposition results obtained. The Ni-Al-Si (4 : 0.5 : 1.5) catalyst reduced with hydrazine hydrate produced better H2 yields of ca. 1815 mol H2/mol Ni than the catalyst reduced with 5% H2/N2. 相似文献
10.
Rama Moorthy Appa Jangam Lakshmidevi Sana Siva Prasad Baitinti Muralidhar Bandameeda Ramesh Naidu Manchala Narasimhulu 《合成通讯》2019,49(1):56-64
A solvent-free, versatile procedure has been developed for the effective synthesis of tert-butanesulfinylimines of a variety of aldehydes using chiral tert-butanesulfinamides under green, sonochemical conditions. This method utilizes silica supported p-toluenesulfonic acid (pTSA·SiO2) as an efficient, safer and inexpensive catalyst under aerobic conditions. The practicable simplicity, easy preparation of the catalyst from readily available substances, high substrate scope, excellent yields of products in short reaction times and environmentally benign (solvent-free sonochemical) conditions are the exceptional assets of this finding. 相似文献