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101.
Mohan Gundluru Santhisudha Sarva Murali Sudileti Sreekanth Tellamekala Subba Rao Yakkate Bakthavatchala Reddy Nemallapudi Suresh Reddy Cirandur 《Journal of heterocyclic chemistry》2020,57(3):1414-1427
In continuance of our effort to improve novel and potent synthetic approaches for various bioactive phosphorylated heterocycles via C─P bond formation, a series of diethyl substituted(2-benzylbenzofuran-3-yl)phosphonate derivatives ( 4a - j ) was synthesized by one-pot reaction of various diversely substituted salicylaldehydes, phenyl acetylene, and diethyl phosphite using CuO nanoparticles as catalyst in 1:1 ethanol and water under room temperature. The new compounds have been studied for their radical scavenging activity by DPPH, H2O2, and NO approaches and antimicrobial activity assay against bacteria and fungi by disk diffusion method. 相似文献
102.
Basheer Sabeel M. Kumar S. L. Ashok Sarathi N. Rasin Puthiyavalappil Kumar M. Saravana Muralisankar Mathiyan Sreekanth A. 《Journal of Solid State Electrochemistry》2023,27(9):2323-2335
Journal of Solid State Electrochemistry - A novel corrosion inhibitor bis(2-acetylpyridine)dithiosemicarbazone (DTSc) has been created and confirmed by different spectroscopic techniques including... 相似文献
103.
Rohini Gandhaveeti Ramaiah Konakanchi Prashanth Jyothi Nattami S. P. Bhuvanesh Sreekanth Anandaram 《应用有机金属化学》2019,33(5)
Two mononuclear ruthenium complexes ( 1 and 2 ) with aroyl/acylthiourea as an ancillary ligand of type, [(η6‐p‐cymene)RuCl(L‐N,S)], where [ L1 = 2,4‐dichloro‐N‐(o‐tolylcarbamothioyl)benzamide] and L2 = N‐(phenylcarbamothioyl)cyclohexanecarboxamide] were synthesized and well characterized. The single crystal X‐ray diffraction studies revealed the coordination mode and the geometry of the complexes. The two complexes adopted general piano‐stool (three‐legged) geometry with a novel coordination mode of aroyl/acylthiourea through amide N (anionic) and thiocarbonyl S (neutral). This type of monobasic bidentate coordination of the aroyl/acylthiourea ligand was witnessed the first time around the metal ion. The coordination of the complexes was well explained through geometric parameters and frontier molecular orbital parameter values computed at the B3LYP/SDD level. The synthesized complexes were also screened for their antibacterial, antifungal, antioxidant and in vitro antiproliferative activities. Complexes exhibited good antimicrobial agents against various pathogens. The antioxidant activity of the complex 2 has shown most potent activity with IC50 value of 48.55 ± 1.7 μM compared to the reference drug. In addition, the in vitro antiproliferative activity of the complex 2 showed excellent activity against HepG‐2 cell line with the IC50 value of 24.30 ± 1.20 μM which is close to Doxorubicin standard drug. 相似文献
104.
105.
Sreekanth Tellamekala Mohan Gundluru Murali Sudileti Santhisudha Sarva Chenna Rohini Kumar Putta Suresh Reddy Cirandur 《Monatshefte für Chemie / Chemical Monthly》2020,151(2):251-260
A straightforward and greener approach has been developed for the synthesis of novel aminomethylene bisphosphonates by one-pot reaction of diverse aryl/heteroaryl amines with dialkyl phosphite and triethyl orthoformate using CuO nanoparticles as catalyst under microwave irradiation and solvent-free conditions. This is an ecofriendly synthetic approach for swift access to a library of diverse aminomethylene bisphosphonates. All the synthesized new compounds were evaluated for their antimicrobial activity by disc diffusion method and antioxidant activity by DPPH, H2O2, and NO methods. The title compounds exhibited significant antioxidant and considerable antimicrobial activities. 相似文献
106.
M. Kondaiah K. Sreekanth D. Sravana Kumar Sk. Md. Nayeem D. Krishna Rao 《Journal of Thermal Analysis and Calorimetry》2014,118(1):475-483
The densities, ρ, and viscosities, η, of binary mixtures of ethylene glycol with formamide, N,N-dimethyl formamide and N,N-dimethyl acetamide, have been measured over the entire composition range at 308.15 K. From this experimental data, excess molar volume, \( V_{\text{m}}^{\text{E}} \) , deviation in viscosity, Δη, and excess Gibbs free energy of activation of viscous flow, \( \Delta G^{{ * {\text{E}}}}, \) have been determined. Negative values of \( V_{\text{m}}^{\text{E}} \) , Δη, and \( \Delta G^{{ * {\text{E}}}} \) are observed over the entire composition range in the mixtures studied. The observed negative values of various excess and deviation parameters are attributed to the existence of strong interactions, like dipole–dipole interactions, H-bonding between the carbonyl group of amide molecules, and hydroxyl group of glycol molecules, geometrical fitting of smaller molecules into the voids created by larger molecules in the liquid mixtures. The excess properties have been fitted to Redlich–Kister-type polynomial, and the corresponding standard deviations have been calculated. The derived partial molar volumes and excess partial molar volumes also support the \( V_{\text{m}}^{\text{E}} \) results. The experimental viscosity data of all of these liquid mixtures have been correlated with four viscosity models. 相似文献
107.
Pogula Sreekanth Reddy Peddiahgari Vasu Govardhana Reddy Sura Mallikarjun Reddy 《Tetrahedron letters》2014
2-Cyclopropylpyrimidin-4-yl-aryl/benzothiazole derived α-aminophosphonates were synthesized in a simple and efficient method from a three-component condensation reaction of 2-cyclopropylpyrimidin-4-carbaldehyde, various anilines/benzothiazole amines, and different phosphites by using 0.5 mol % of phosphomolybdic acid (PMA, H3PMo12O40) in dichloromethane at room temperature in good to excellent yields with short reaction times. 相似文献
108.
S. Ramanaiah P. Reddi Rani T. V. M. Sreekanth K. S. Reddy 《Journal of Macromolecular Science: Physics》2013,52(3):551-562
The specific retention volumes, , for adsorption of 21 solute probes on the solid surface of cellulose acetate butyrate (CAB) were determined in the temperature range 343.15 to 403.15 K by inverse gas chromatography (IGC). The weight fraction activity coefficients, , and Flory–Huggins interaction parameters, , were evaluated using . Both and values decreased with increase of temperature in all the solutes. Further, the values increased with increase of chain length in n-alkanes, but in the case of alcohols the trend was reversed. values were less than 0.5 in polar solutes and greater than 0.5 in 1-alkanes and alcohols. The Hansen solubility parameters (HSP) were calculated by relating with the cohesive energy of adsorption of the solutes on the surface of CAB. The adsorption model proposed by Snyder and Karger was used to determine the HSP for the CAB. The dispersive, , polar, , and hydrogen bonding components of HSP decreased with increase of temperature and the relative error associated with these parameters increased with increase of temperature. The characterization of the solid surface of CAB in terms of the three solubility parameter components was analyzed and is discussed. 相似文献
109.
The solutions for the stress and displacement fields due to an arbitrary dislocation segment in an isotropic bi-material medium consisting of joined three-dimensional (3D) half spaces are derived and expressed in terms of line integrals, integrands of which are given in an exact analytical form that, in turn, can also be integrated to yield analytical expressions for the stress–displacement field. The solution is constructed by employing a general solution derived by Walpole [Int. J. Eng. Sci. 34 (1996) p.629] for any elastic singularity in joined isotropic half space, and combining it with Mura's integral formula for the displacement gradient of an arbitrary dislocation segment in homogeneous medium. The resulting new solution provides a framework for deriving analytical expressions for stress and displacement fields of dislocation curves of arbitrary shapes and orientations. The benefit of the method developed, as compared with other methods found in the literature, is that the new solution presented is naturally divided into two components, a homogenous component representing the field of a dislocation in an infinitely homogenous medium, and an image component. This makes it easy and straightforward to modify existing dislocation dynamics codes that already include the homogenous part. To illustrate the accuracy of the method, the stress field expressions of an edge dislocation with Burgers vector perpendicular to the bi-material interface are derived as a degenerate case of the general result. It is shown that our solution is identical to that found in the literature for this case. 相似文献
110.
Sreekanth T. V. M. Pandurangan Muthuraman Jung Min-Ji Lee Yong Rok Eom In-Yong 《Research on Chemical Intermediates》2016,42(6):5665-5676
Research on Chemical Intermediates - The aim of the present study was to focus on the green synthesis of silver nanoparticles (AgNPs) using the aqueous extract of dried jujube fruit and the... 相似文献