全文获取类型
收费全文 | 404篇 |
免费 | 1篇 |
专业分类
化学 | 222篇 |
晶体学 | 4篇 |
力学 | 1篇 |
数学 | 67篇 |
物理学 | 111篇 |
出版年
2022年 | 6篇 |
2021年 | 4篇 |
2020年 | 9篇 |
2019年 | 11篇 |
2018年 | 14篇 |
2017年 | 9篇 |
2016年 | 12篇 |
2015年 | 5篇 |
2014年 | 7篇 |
2013年 | 13篇 |
2012年 | 20篇 |
2011年 | 16篇 |
2010年 | 20篇 |
2009年 | 15篇 |
2008年 | 16篇 |
2007年 | 17篇 |
2006年 | 12篇 |
2005年 | 19篇 |
2004年 | 7篇 |
2003年 | 8篇 |
2002年 | 14篇 |
2001年 | 10篇 |
2000年 | 5篇 |
1999年 | 8篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1995年 | 6篇 |
1994年 | 4篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1989年 | 2篇 |
1987年 | 2篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1982年 | 10篇 |
1980年 | 3篇 |
1979年 | 8篇 |
1978年 | 5篇 |
1977年 | 2篇 |
1976年 | 6篇 |
1975年 | 11篇 |
1974年 | 7篇 |
1973年 | 10篇 |
1972年 | 3篇 |
1971年 | 6篇 |
1970年 | 5篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1962年 | 1篇 |
排序方式: 共有405条查询结果,搜索用时 0 毫秒
1.
N. S. Zefirov N. V. Zyk E. K. Beloglazkina V. S. Tyurin 《Russian Chemical Bulletin》1995,44(2):315-317
Two systems for arene sulfenylation were investigated: arenesulfenamides in the presence of SO3 and sulfenylacetate complexes with AlBr3. A preference for the second reagent was demonstrated for sulfenylation of substrates bearing donor substituitents.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 324–326, February, 1995. 相似文献
2.
3.
4.
5.
Smirnov O. Yu. Churakov A. M. Tyurin A. Yu. Strelenko Yu. A. Ioffe S. L. Tartakovsky V. A. 《Russian Chemical Bulletin》2002,51(10):1849-1856
Nucleophilic substitution in nitro- and bromobenzo-1,2,3,4-tetrazine 1,3-dioxides (BTDOs) was studied. In most cases, the bromo and nitro groups are replaced by methylamino, dimethylamino, azido, and methoxy groups without opening of the tetrazine ring. It was illustrated with the reactions of dibromo-BTDOs with sodium methoxide that the reactivity of positions 5 to 8 in their benzene ring as regards nucleophilic substitution changes in the following order: 6 > 8 > 7 > 5. The structures of the BTDOs obtained were confirmed by 1H, 13C, and 14N NMR data. 相似文献
6.
A. M. Churakov A. Yu. Tyurin E. L. Goncharova S. L. Ioffe Yu. A. Strelenko V. A. Tartakovsky 《Russian Chemical Bulletin》1995,44(5):890-896
The addition of 1-aryl-2-bromodiazene 1-oxides to olefins yields 1-aryl-2-(2-bromoalkyl)diazene 1-oxides (4). A radical mechanism of the reaction has been suggested. Compounds4 decompose to give bromohydrazones of formaldehyde and aldehydes. The structural factors that affect the rate of this process are discussed.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 917–923, May, 1995.The work was carried out in the Scientific Educational Center of the Institute of Organic Chemistry of the RAS with financial support of the Russian Foundation for Basic Research (Project No. 93-03-18461). 相似文献
7.
A. Yu. Tyurin A. M. Churakov Yu. A. Strelenko M. O. Ratnikov V. A. Tartakovsky 《Russian Chemical Bulletin》2006,55(9):1648-1653
Thermolysis of o-diazidobenzotetrazine 1,3-dioxides was accompanied by cleavage of the C-C bond of the benzene ring to give nonannulated 1,2,3,4-tetrazine
1,3-dioxides. The structures of these first representatives of nonfused 1,2,3,4-tetrazines were confirmed by 13C and 14N NMR spectroscopy.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1589–1594, September, 2006. 相似文献
8.
9.
A. Yu. Tyurin A. M. Churakov S. L. Ioffe Yu. A. Strelenko V. A. Tartakovsky 《Russian Chemical Bulletin》1997,46(3):592-594
The reactions of 1-aryl-2-bromodiazene 1-oxides with HCl in nonaqueous media give aryldiazonium chlorides, while 1,3,3-substituted
triazenes-1 are formed in the reactions with secondary amines. Using 2-{15N} label, it was shown that the aryl group does not migrate in these reactions.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 613–615, March, 1997. 相似文献
10.
Tanskanen H Khriachtchev L Räsänen M Feldman VI Sukhov FF Orlov AY Tyurin DA 《The Journal of chemical physics》2005,123(6):64318
Vinyl radicals produced by annealing-induced reaction of mobilized hydrogen atoms with acetylene molecules in solid noble-gas matrices (Ar, Kr, and Xe) were characterized by Fourier transform infrared and electron paramagnetic resonance (EPR) spectroscopies. The hydrogen atoms were generated from acetylene by UV photolysis or fast electron irradiation. Two vibrational modes of the vinyl radical (nu7 and nu5) were assigned in IR absorption studies. The assignment is based on data for various isotopic substitutions (D and 13C) and confirmed by comparison with the EPR measurements and density-functional theory calculations. The data on the nu7 mode is in agreement with previous experimental and theoretical results whereas the nu5 frequency agrees well with the computational data but conflicts with the gas-phase IR emission results. 相似文献