全文获取类型
收费全文 | 186篇 |
免费 | 2篇 |
专业分类
化学 | 185篇 |
力学 | 1篇 |
物理学 | 2篇 |
出版年
2022年 | 1篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 7篇 |
2018年 | 9篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 10篇 |
2012年 | 5篇 |
2011年 | 7篇 |
2010年 | 9篇 |
2009年 | 15篇 |
2008年 | 8篇 |
2007年 | 8篇 |
2006年 | 9篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 10篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 1篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 6篇 |
1987年 | 1篇 |
1984年 | 2篇 |
1982年 | 5篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1973年 | 3篇 |
1972年 | 3篇 |
1971年 | 1篇 |
1970年 | 4篇 |
1968年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有188条查询结果,搜索用时 15 毫秒
31.
32.
Yu. S. Syroeshkina L. L. Fershtat M. A. Syroeshkin V. V. Kuznetsov K. A. Lyssenko N. N. Makhova 《Russian Chemical Bulletin》2009,58(5):1002-1006
Complexes of bicyclic diaziridines 6,6′-bi(1,5-diazabicyclo[3.1.0]hexane) (L
1
) and 6-(4-methoxyphenyl)-1,5-diazabicyclo[3.1.0]hexane (L
2
) with the salts Cd(NO3)2 · 4H2O and Cd(ClO4)2 · 6H2O have been synthesized. The fact of complexation has been established by cyclic voltammetry. The crystal structure of complex
L
1
with Cd(NO3)2 (the coordination number of cadmium is 8) has been studied by X-ray diffraction. 相似文献
33.
Yu. S. Syroeshkina V. V. Kuznetsov K. A. Lyssenko N. N. Makhova 《Russian Chemical Bulletin》2009,58(2):366-379
The present study revealed two new reactions resulting in the diaziridine ring expansion, viz., the insertion of the CS2 molecule and the CN group of activated nitriles into the C—N bond of the diaziridine fragment of 6-aryl-1,5-diazabicyclo[3.1.0]hexanes.
These reactions can be performed only in ionic liquids in the presence of BF3 · Et2O as the catalyst. Based on these reactions, we developed simple one-pot methods for the synthesis of 3-aryldihydro-5 H-pyrazolo[1,2- c][1,3,4]thiadiazole-1-thiones and 1-aryl-6,7-dihydro-1 H,5H-pyrazolo-[1,2-a][1,2,4]triazoles in high yields. Dipolar intermediates of new reactions, which are direct precursors of the final products,
were detected by NMR methods. One of the intermediates was isolated and characterized. The reaction of 6-aryl-1,5-diazabicyclo[3.1.0]hexanes
with benzoyl cyanide affords (2-benzoyrpyrazolidin-1-yl)(aryl)acetonitriles. 相似文献
34.
Andrey S. Sigachev Angelina N. Kravchenko Galina A. Gazieva Pavel A. Belyakov Natal'Ya G. Kolotyrkina Oleg V. Lebedev Nina N. Makhova Konstantin A. Lyssenko 《Journal of heterocyclic chemistry》2006,43(5):1295-1302
35.
Leonid L. Fershtat Marina I. Struchkova Alexander S. Goloveshkin Ivan S. Bushmarinov Nina N. Makhova 《Heteroatom Chemistry》2014,25(4):226-237
4‐Nitrofuroxans (4‐nitro‐1,2,5‐oxadiazole 2‐oxides) were prepared by a dinitrogen trioxide–mediated domino reaction of acrylic acids under the action of NaNO2 excess in AcOH at room temperature. The reaction proceeds completely regioselectively and presents a new, simple, general, and safe method for the preparation of both 3‐aryl‐ and 3‐alkyl‐4‐nitrofuroxans available with difficulty before. A mechanism for the furoxan ring construction through a four‐step one‐pot protocol is proposed. The synthesized nitrofuroxans have been characterized by multinuclear NMR spectroscopy and X‐ray powder diffraction. 相似文献
36.
A. V. Shevtsov V. Yu. Petukhova S. A. Kutepov V. V. Kuznetsov N. N. Makhova N. E. Kuz'mina G. G. Aleksandrov 《Russian Chemical Bulletin》2000,49(11):1882-1886
A series of complexes ofN-(2-aminoethyl)diaziridines with transition metal salts (Zn2+, Cd2+, Ni2+, Co2+, Mn2+, or Fe2+) were synthesized. Their structures were established by IR and NMR spectroscopy. The structure of bis[1,2-bis(2-aminoethyl)diaziridine]cadmium(II)
diperehlorate was confirmed by X-ray diffraction analysis.
Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1910–1914, November, 2000. 相似文献
37.
38.
Two methods for the generation of nitroformonitrile oxide (NFNO) were proposed, namely, by dehydration of dinitromethane and by nitration of 2-methyl-1-nitro-1-propene. NFNO was identified as its cyclodimerization product, dinitrofuroxan.Deceased.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 722–726, April, 1995. 相似文献
39.
Molotov S. I. Kulikov A. S. Strelenko Yu. A. Makhova N. N. Lyssenko K. A. 《Russian Chemical Bulletin》2003,52(8):1829-1834
3-Arylazo-4-(3-ethoxycarbonylureido)furoxans, which were synthesized by the reactions of 4-amino-3-arylazofuroxans with ethoxycarbonyl isocyanate, were subjected to cascade rearrangements under the action of potassium tert-butoxide in dimethylformamide or by heating in dimethyl sulfoxide to form 4-amino-2-aryl-5-nitro-2H-1,2,3-triazoles. X-ray diffraction study and quantum-chemical calculations (B3LYP/6-31G**) of one of ureidofuroxans demonstrated that the intramolecular contact between the carbonyl group and the nitrogen atom of furoxan corresponds to the charge transfer from the lone electron pair of the oxygen atom to the antibonding orbital of the N—O bond. 相似文献
40.