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排序方式: 共有86条查询结果,搜索用时 15 毫秒
1.
Leong‐Huat Gan Palaniswamy Ravi Bao Wei Mao Kam‐Chiu Tam 《Journal of polymer science. Part A, Polymer chemistry》2003,41(17):2688-2695
Polymerization of 2‐(diethylamino)ethyl methacrylate (DEAEMA) via homogeneous atom transfer radical polymerization under various reaction conditions is described. The effects of the initiators and solvents were examined. With 1,1,4,7,10,10‐hexamethyl triethylenetetramine/copper(I) chloride/p‐toluenesulfonyl chloride as the ligand/catalyst/initiator system in methanol, poly(DEAEMA) with a polydispersity index as low as 1.07 was synthesized. Kinetic studies demonstrated the polymerization was very well controlled and exhibited the living characteristic of the process. Well‐defined block copolymers of DEAEMA and tert‐butyl methacrylate (tBMA) were successfully synthesized. The copolymers could be synthesized with equally good results by starting with either p(DEAEMA) or p(tBMA) as the macroinitiators. However, only the macroinitiators terminated with chlorine should be used. The corresponding macroinitiators with bromine as a transferable group did not yield well‐defined copolymers. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 2688–2695, 2003 相似文献
2.
Venkatapuram Padmavathi Boggu Jagan Mohan Reddy Adivireddy Padmaja 《Journal of heterocyclic chemistry》2005,42(2):333-335
A new class of 3,4‐disubstituted pyrroles has been prepared by the reaction of 1‐aroyl‐2‐arylsul‐fonylethenes and 1,2‐diarylsulfonylethenes with tosyl methyl isocyanide. 相似文献
3.
Venkatapuram Padmavathi Mudigonda Rajagopala Sarma Adivireddy Padmaja Dandu Bhaskar Reddy 《Journal of heterocyclic chemistry》2003,40(5):933-937
Novel 2‐pyrazolines were obtained by the cycloaddition of diazomethane to bis(arylsulfonylethenyl)‐sulfones ( 3 ) and 1‐arylsulfonyl‐2‐styrylsulfonylethenes (7). Dehydrogenation of 2‐pyrazolines with chloranil gave pyrazoles. 相似文献
4.
Venkatapuram Padmavathi Pinnu Thriveni Boggu Jagan Mohan Reddy Adivireddy Padmaja 《Journal of heterocyclic chemistry》2005,42(1):113-116
A new class of five membered heterocycles, thiadiazoles, triazoles and oxadiazoles were prepared from sulfonyl acetic acids via acid hydrazides. 相似文献
5.
N. Muthukumar S. Maruthamuthu A. Ilangovan N. Palaniswamy 《Surface and interface analysis : SIA》2007,39(6):533-541
Biodegradation occurs in the diesel/water interface in petroleum product pipelines. The microbial contamination can result in inhibitor/fuel degradation, leading to unacceptable levels of turbidity, filter plugging, storage tank corrosion and stored product souring. Therefore, selection of the biocide/inhibitor plays an important role in the transportation of petroleum products through pipelines. Three biocides (cationic and nonionic) were employed to study the biodegradation in a diesel‐water interface. The biocidal efficiency against degradation of diesel was examined by employing Fourier‐transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy and gas chromatography mass spectrometry (GC‐MS) techniques. Bronopol (2‐bromo‐2‐nitro‐propane‐1, 3‐diol) was found to have higher bactericidal efficiency than N‐cetyl‐N,N, N‐trimethyl ammonium bromide (CTAB) and cetyl pyridinum bromide (CPB). But the cationic biocides (CTAB and CPB) showed good biocidal efficiency at the interface. The data are explained in terms of a model that postulates the formation of a ‘micelle’ at the diesel‐water interface. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
6.
Chokalingam Saravanan Marimuthu Senthilkumaran Bosco Christin Maria Arputham Ashwin Palaniswamy Suresh Paulpandian Muthu Mareeswaran 《Journal of inclusion phenomena and macrocyclic chemistry》2017,87(3-4):239-250
The ligand salt, Me6[14]diene·2HClO4 (L·2HClO4) was prepared by condensation of acetone and ethylene diamine in the presence of perchloric acid. On reduction of this diene ligand salt, L·2HClO4 with sodium borohydride, the two isomeric ligands, ‘tet-a’ and ‘tet-b’ were produced. The ligands, on reaction with ZnX2 (X=Cl, ClO4, NO3 or CH3COO) and ZnSO4 produced the corresponding complexes. These complexes have been characterized on the basis of elemental analyses; IR, UV–Vis and 1H-NMR spectroscopies; magnetic and conductance data. Based on these data, all of the complexes of the diene ligand L, as well as the perchlorate complexes of all of the ligands attained a square-pyramidal arrangement, whereas the complexes of ‘tet-a’ and ‘tet-b’, with X=NO3, Cl or CH3COO and with ZnSO4 salt, were octahedral. Moreover, all complexes were monometallic except the nitrato complex, [(ZnL)2(µ-NO3)](ClO4)3 which is bimetallic. The structure of [(ZnL)2(µ-NO3)](ClO4)3 has been confirmed by X-ray crystallography. In this complex the zinc centres lie within a N4O donor set, with the four nitrogen donors from L and one of the oxygen atom stemming from the bridging NO3. The complexes show different electrolytic behavior in different solvents. The antibacterial activities of the ligands and complexes towards different phytopathogenic bacteria have been investigated. 相似文献
7.
Anil Kumar Gunthanakkala Madhu Sekhar Mangali Padmavathi Venkatapuram Padmaja Adivireddy 《Journal of heterocyclic chemistry》2020,57(12):4164-4174
A new class of bis(arylsulfonylmethylazolyl)pyridines and bis(arylaminosulfonylmethyl-azolyl)pyridines were synthesized from the synthetic intermediates methyl arylsulfonylacetic acid hydrazide and methyl arylaminosulfonylacetic acid hydrazide adopting a green methodology-ultrasonication. All the synthesized compounds were resulted in higher yield and in shorter reaction times. The spectral parameters such as IR, 1H NMR, 13C NMR, mass and microanalyzes were used to determine the structures of all the synthesized compounds and were assayed for antioxidant activity. The bis(arylaminosulfonylmethylazolyl)pyridines showed higher radical scavenging activity than the bis(arylsulfonylmethylazolyl)pyridines. Besides, unsubstituted, and methyl substituted compounds exhibited greater activity. Among all the tested compounds 8b and 11b were identified as potential antioxidants. 相似文献
8.
Venkatapuram Padmavathi Sanapalli Nagi Reddy Guda Dinneswara Reddy Bhumireddy Chinnachennaiahgari Venkatesh Adivireddy Padmaja 《Journal of heterocyclic chemistry》2011,48(5):1197-1201
A new class of bis heterocycles—sulfone linked pyrazolyl oxadiazoles thiadiazoles were prepared from E‐phenylsulfonylethenesulfonylacetic acid and studied their antimicrobial activities. J. Heterocyclic Chem., (2011). 相似文献
9.
Synthesis and Antimicrobial Activity of Amido Sulfonamido Methane Linked Bisoxazoles,Bisthiazoles, and Bisimidazoles
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Chokkappagari Premakumari Dandu Seenaiah Akula Srilakshmi Divi Venkata Ramana Sai Gopal Venkatapuram Padmavathi 《Journal of heterocyclic chemistry》2014,51(6):1875-1882
A new class of amido sulfonamido methane linked bisoxazoles, bisthiazoles, and bisimidazoles were prepared adopting simple and versatile synthetic methodologies. The lead compounds were assayed for antimicrobial activity. 相似文献
10.
Synthesis of a New Class of Sulfonamido Bis Heterocycles—Pyrrolyl/Pyrazolyl‐1,3,4‐oxadiazoles, 1,3,4‐Thiadiazoles,and 1,2,4‐Triazoles
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Akkarapalli Muralikrishna Guda Mallikarjuna Reddy Gopala Lavanya Venkatapuram Padmavathi Adivireddy Padmaja 《Journal of heterocyclic chemistry》2014,51(1):179-190
A new class of sulfonamido bis heterocycles—pyrrolyl/pyrazolyl‐oxadiazoles, thiadiazoles, and triazoles—were prepared from arylaminosulfonylacetic acid hydrazide and E‐aroylethenesulfonylacetic acid adopting simple and versatile synthetic methodologies. 相似文献