排序方式: 共有127条查询结果,搜索用时 15 毫秒
31.
A series of new bis derivatives of 2,5-thiadiazole and N,N′-thiocarbohydrazide along with their transition metal complexes were synthesized by green methods (sonochemical and microwave), i.e., energy and time efficient and operationally more simple than existing conventional methods. All the synthesized compounds were fully characterized by routine analytical techniques and subjected to a preliminary biological screening. These novel characterized compounds were screened for antimicrobial activities and showed promising results. A few potent compounds were also tested for antitumor activities against MDA-MB231 (human breast carcinoma cell line) and compound 5 has emerged as a potential antitumor compound followed by compound 2, 10 and 9, with IC50 values of 29.48, 32.25, 32.34 and 34.34 μg/ml, respectively. To understand the binding interactions of these compounds, in silico studies were performed using the AUTODOCK 4.2 suite and found to be supportive of the experimental results. 相似文献
32.
Benjaram M. Reddy G. Sarala Devi Pavani M. Sreekanth 《Research on Chemical Intermediates》2002,28(6):595-601
The vapor-phase catalytic O-alkylation of - and -naphthols with methanol has been investigated over lanthanum, cerium, samarium, and antimony phosphate catalysts promoted with cesium hydroxide. Among various catalysts investigated, the Cs-SmPO4 combination catalyst provided better catalytic activity and selectivity. The CsOH promoter suppressed formation of C-alkylated side products and enhanced the O-alkylation selectivity. Characterization of these catalysts by X-ray diffraction and FT-infrared techniques revealed that the cesium promoter has no influence on the bulk structure of the catalysts. Temperature programmed desorption of anhydrous ammonia over promoted and unpromoted catalysts revealed that the cesium promoter decreases total surface acidity of the catalysts. 相似文献
33.
Highly efficient Pd‐PEPPSI‐IPr catalyst for N‐(4‐pyridazinyl)‐bridged bicyclic sulfonamides via Suzuki–Miyaura coupling reaction 下载免费PDF全文
Mallikarjuna Reddy Sura N. Reddy Bijivemula Sreekanth Reddy Pogula Venkata Krishna Reddy Motakatla Pathak Madhvesh Vasu Govardhana Reddy Peddiahgari 《应用有机金属化学》2018,32(2)
A protocol for the Suzuki–Miyaura coupling of novel 2‐(6‐chloropyridazin‐3‐yl)‐5‐(aryl/heteroarylsulfonyl)‐2,5‐diazabicyclo[2.2.1]heptanes and heteroarylboronic acids to afford variety of coupled products was realized. Pd‐PEPPSI‐IPr catalyst was found to be a powerful and reusable catalyst under relatively mild reaction conditions. 相似文献
34.
A. Sreekanth V. Suni Rohith P. John Munirathinam Nethaji M. R. Prathapachandra Kurup 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(6):m284-m286
The title compound, [Cu2(C17H17N4S)2Cl2], exhibits a dimeric structure related by a centre of symmetry. The monomers are linked to each other by the longest Cu—S apical distance observed to date among CuII square‐pyramidal complexes of N4‐substituted thiosemicarbazones. Each CuII atom deviates from the coordination square plane, which contains the pyridyl and imine N atoms, the thiolate S atom and the Cl− anion, towards the S atom of the adjacent monomer. The dimers pack in a zigzag manner through the crystal. 相似文献
35.
K. V. Sreekanth V. M. Murukeshan 《Applied Physics A: Materials Science & Processing》2010,101(1):117-120
This paper describes and compares the effect of metal films, such as aluminum (Al) and silver (Ag) on UV-excited two-beam
surface plasmon interference nanolithography. A planar four-layer configuration has been employed to study the light intensity
distribution on the recording medium. It is observed that high-density sub-50 nm periodic structures were achievable by employing
the above-mentioned metal films when interrogated with p-polarized, 364 nm illumination wavelength source. It is found that
the obtained periodic feature shows good exposure depth and high contrast when Al is used as a metal film. The initial experimental
result of planar four-layer configuration is also presented. 相似文献
36.
37.
38.
Jemini Jose Athimotlu Raju Rajamani Sreekanth Anandaram Sujin P. Jose Sebastian C. Peter Sreeja P B 《应用有机金属化学》2019,33(9)
Covalently anchored chromium complex on reduced graphene oxide (rGO‐Cr) is successfully synthesised through trimethoxy silyl propanamine (TMSPA) and phenyl azo salicylaldehyde (PAS) coupling. The rGO‐Cr is characterised by Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), electron dispersive analysis of X‐rays (EDAX), Raman spectroscopy, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). Absorption and emission properties of rGO‐TMSPA‐PAS are studied by excitation dependent photoluminescence emissions at room temperature. Electrochemical sensing activity of rGO‐Cr is monitored for paracetamol using modified glassy carbon electrode. Cyclic voltammetry measurements indicated that rGO‐Cr substantially enhance the eletrochemical response of paracetamol. The experimental factors are investigated and optimized. 相似文献
39.
Caussanel F Wang K Ramachandran SA Deslongchamps P 《The Journal of organic chemistry》2006,71(19):7370-7377
Total syntheses of two new (+/-)-kempane derivatives 30 and 47 were achieved with transannular Diels-Alder reaction (TADA) serving as the key step for the stereoselective formation of tricyclic [6.6.5] system 3. This synthetic approach also reveals that the geometry of the C3 group of such a tricyclic system plays an important role for the formation of the seven-membered kempane skeleton. 相似文献
40.
Maire P Königsmann M Sreekanth A Harmer J Schweiger A Grützmacher H 《Journal of the American Chemical Society》2006,128(20):6578-6580
A [16 + 1] valence electron configured rhodium aminyl radical complex could be synthesized and characterized in detail by pulse EPR spectroscopy and DFT calculations. The unpaired electron is delocalized over the metal center and two adjacent nitrogens. H-abstraction reactions from thiols and triethylsilane show that the spin density is predominantly localized on both nitrogens. 相似文献