全文获取类型
收费全文 | 94篇 |
免费 | 3篇 |
专业分类
化学 | 87篇 |
晶体学 | 6篇 |
物理学 | 4篇 |
出版年
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 1篇 |
2013年 | 17篇 |
2012年 | 3篇 |
2011年 | 4篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 7篇 |
2007年 | 2篇 |
2006年 | 5篇 |
2005年 | 6篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 3篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1958年 | 3篇 |
排序方式: 共有97条查询结果,搜索用时 15 毫秒
91.
Subba Rao Devineni Srinivasulu Doddaga Rajasekhar Donka Naga Raju Chamarthi 《中国化学快报》2013,24(8):759-763
CeCl3·7H2O supported on silica(CeCl3·7H2O-SiO2) is used as a heterogeneous,efficient and recyclable catalyst for a three component one-pot reaction of an amine,aldehydes and diethyl phosphite to synthesizeα-diaminophosphonate derivatives under microwave irradiation exploiting neat reaction conditions.Tenα-diaminophosphonates(6a-j) of 4,4’-sulfonyldianiline(Dapsone)(3) were synthesized and structural elucidation was confirmed by spectral data.Antifungal and antioxidant activities were evaluated include minimum inhibitory concentrations and IC50 values,respectively of the titled compounds.Compounds 6h,6i exhibited promising antioxidant activity at lower IC50 values 53.7μg/mL, 53.2μg/mL,respectively as compared with standard IC50 value 51.6μg/mL. 相似文献
92.
M. Varalakshmi D. Srinivasulu D. Rajasekhar C. Naga Raju S. Sreevani 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):106-112
Abstract A new class of diethyl(3,5-dibromo-4-hydroxyphenylamino) (substituted phenyl/heterocyclic) methylphosphonates 4(a–j) has been synthesized by one-pot three component simultaneous reaction (Kabachnik–Fields) of 4-amino-2,6-dibromophenol 1, substituted heterocyclic/phenyl aldehydes 2(a–j), and diethylphosphite 3 using a Lewis acid catalyst, CeCl3·7H2O (5 mol%) under microwave irradiation as well as conventional conditions. It was observed that microwave irradiation method is more facile, efficient, and advantageous with respect to reaction time and yields. The structures of all the synthesized compounds were supported by analyzing IR, 1H/13C/31P NMR, and mass spectral data. The synthesized compounds were screened for their in vitro antimicrobial and antioxidant activities. 相似文献
93.
Koduri S. V. Srinivas Reguri Buchireddy Gutta Madhusudhan Khagga Mukkanti Polisetty Srinivasulu 《Chromatographia》2008,68(7-8):635-640
The present paper describes the development of a stability indicating reversed phase column liquid chromatographic method for aripiprazole in the presence of its impurities and degradation products generated from forced decomposition studies. The drug substance was subjected to stress conditions of aqueous hydrolysis, oxidative, photolytic and thermal stress degradation. The degradation of aripiprazole was observed under acid hydrolysis and peroxide. The drug was found to be stable to other stress conditions attempted. Successful separation of the drug from the synthetic impurities and degradation products formed under stress conditions was achieved on an Inertsil phenyl column using a mixture of 0.2% trifluoroacetic acid and acetonitrile (55:45, v/v). The developed LC method was validated with respect to linearity, accuracy, precision, specificity and robustness. The assay method was found linear in the range of 25–200 μg mL?1 with a correlation coefficient of 0.9999 and the linearity of the impurities were established from LOQ to 0.3%. Recoveries of the assay and impurities were found between 97.2 and 104.6%. The developed LC method for the related substances and assay determination of aripiprazole can be used to evaluate the quality of regular production samples. It can also be used to test the stability samples of aripiprazole. To the best of our knowledge, the validated stability indicating LC method which separates all the impurities disclosed in this investigation was not published elsewhere. 相似文献
94.
B. Sunil Kumar N. Srinivasulu R. H. Udupi B. Rajitha Y. Thirupathi Reddy P. Narsimha Reddy P. S. Kumar 《Journal of heterocyclic chemistry》2006,43(6):1691-1693
Three component coupling of one pot reaction which servers as the most convenient route to the synthesis of benzopyran derivatives using the TiCl4 catalyst (10 mol %) under solvent free conditions is described. The procedure offers a systematic method with a number of advantages including operational simplicity, neat reactions, reduced reaction time, high yields of products and applicability to large scale reactions. 相似文献
95.
Novel 2‐alkylcarbamato/thiocarbama‐to‐2,3‐dihydro‐5‐propylthio‐1H‐1,3,2‐benzodiazaphos‐phole 2‐oxides ( 4a–J ) were synthesized by cyclization of 4‐propylthio‐1,2‐phenylenediamine ( 3 ) with the corresponding dichlorophosphoryl carbamates/thiocarbamates ( 2a–J ) that were obtained by the addition of alcohols/thiols to isocyanatophosphoryl dichloride ( 1 ). The structures of the title compounds were confirmed by the 1H, 13C, 31P NMR, and mass spectral studies. Some of these products were found to possess significant antimicrobial activity. © 2000 John Wiley & Sons, Inc. Heteroatom Chem 11:336–340, 2000 相似文献
96.
P. Vasu Govardhana Reddy Y. Hari Babu C. Suresh Reddy D. Srinivasulu 《Heteroatom Chemistry》2002,13(4):340-345
Syntheses of 2‐aryloxy/2‐chloro ethoxy‐2,3‐dihydro‐5‐benzoyl‐1H‐1,3,2‐benzodiaza‐phosphole 2‐oxides 3a–h were accomplished by reactions of equimolar quantities of 3,4‐diaminobenzophenone ( 1 ) with various aryl/chloroethoxy phosphorodichloridates 2a–g and 2h in the presence of triethylamine at 50–60°C. Compounds 3i–k were prepared by reacting 3,4‐diaminobenzophenone ( 1 ) with aryl thiophosphorodichloridates 2i–k under similar conditions. They were characterized by IR, 1H, 13C, and 31P NMR spectral data. Some of these products possessed siginificant antimicrobial activity © 2002 Wiley Periodicals, Inc. Heteroatom Chem 13:340–345, 2002; Published online in Wiley Interscience (www.interscience.wiley.com). DOI 10.1002/hc.10044 相似文献
97.