全文获取类型
收费全文 | 117篇 |
免费 | 0篇 |
专业分类
化学 | 114篇 |
物理学 | 3篇 |
出版年
2021年 | 4篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 5篇 |
2015年 | 5篇 |
2014年 | 5篇 |
2013年 | 3篇 |
2012年 | 2篇 |
2011年 | 13篇 |
2010年 | 5篇 |
2009年 | 8篇 |
2008年 | 4篇 |
2007年 | 2篇 |
2006年 | 6篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 2篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1972年 | 2篇 |
1969年 | 1篇 |
排序方式: 共有117条查询结果,搜索用时 264 毫秒
111.
112.
V. Lokshin N.A. Larina O.A. Fedorova A. Metelitsa V. Khodorkovsky 《Journal of photochemistry and photobiology. A, Chemistry》2009,201(1):8-14
A series of 2-benzyl-3-benzoyl-4(1H)-quinolone derivatives was investigated. The UV–vis spectra of all photochromic derivatives and the corresponding colored photoenols are similar and almost solvent independent. In contrast, the stability of the photoenols depends strongly on the substituents at the quinolone moiety and solvent. We conclude that conversion of the photoinduced forms into the initial quinolones occurs through ionization rather than usual for photochromic compounds thermal relaxation or sigmatropic H-shift. The experimental observations are in good agreement with the results of quantum mechanical calculations. 相似文献
113.
A. V. Metelitsa O. T. Lyashik N. B. Volbushko E. A. Medyantseva M. I. Knyazhanskii V. I. Minkin 《Chemistry of Heterocyclic Compounds》1990,26(8):953-953
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1137–1138, August, 1990. 相似文献
114.
I. Yu. Grishin Yu. M. Chunaev N. M. Przhiyalgovskaya A. V. Metelitsa 《Chemistry of Heterocyclic Compounds》1992,28(3):355-356
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 422–423, March, 1992. 相似文献
115.
M. V. Shevchuk L. A. Metelitsa L. L. Charochkina S. E. Mogilevich E. B. Rusanov A. E. Sorochinsky V. P. Khilya V. D. Romanenko V. P. Kukhar 《Russian Chemical Bulletin》2011,60(4):712-718
The Petasis reaction between glyoxylic acid, α-amino phosphonates, and organylboronic acid afforded N-phosphonomethyl-α-amino acids. This method has an advantage of preparative simplicity and high diastereoselectivity of the
reactions. Immunotropic activity of the synthesized compounds was studied using the models in vivo. 相似文献
116.
N. I. Makarova E. N. Shepelenko O. G. Karamov A. V. Metelitsa V. A. Bren’ V. I. Minkin 《Russian Chemical Bulletin》2014,63(1):109-114
New nonsymmetrical dihetarylethenes, 3-(1-benzyl-5-methoxy-2-methyl-1H-indol-3-yl)-4-(3-thienyl)furan-2,5-dione and 1-alkyl- and (1-aryl)-3-(1-benzyl-5-methoxy-2-methyl-1H-indol-3-yl)-4-(3-thienyl)-1H-pyrrole-2,5-dione, exhibiting photochromic properties in solutions were synthesized. Noncyclic isomers of dihetarylethenes show fluorescence with quantum yields up to 0.13. 相似文献
117.
S. K. Balenko V. P. Rybalkin N. I. Makarova S. O. Bezuglyi E. N. Shepelenko L. L. Popova V. V. Tkachev S. M. Aldoshin A. V. Metelitsa V. A. Bren’ V. I. Minkin 《Russian Chemical Bulletin》2008,57(7):1435-1443
New 3-indolylfulgides, viz., 3-[1-(1-aryl-5-methoxy-2-methyl-1H-indol-3-yl)ethylidene]-4-(1-methylethylidene)tetrahydro-2,5-furandiones, were synthesized. These compounds were obtained
as E-isomers, as demonstrated by X-ray diffraction, electronic spectroscopy, and 1H NMR spectroscopy. Fulgides exhibit photochromic properties in solution. The cyclic dihydrocarbazole photoisomers of indolylfulgides
show fluorescence properties and are characterized by high thermal stability.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1417–1423, July, 2008. 相似文献