全文获取类型
收费全文 | 126篇 |
免费 | 2篇 |
专业分类
化学 | 110篇 |
数学 | 9篇 |
物理学 | 9篇 |
出版年
2022年 | 1篇 |
2021年 | 5篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 10篇 |
2017年 | 8篇 |
2016年 | 14篇 |
2015年 | 3篇 |
2014年 | 9篇 |
2013年 | 17篇 |
2012年 | 10篇 |
2011年 | 6篇 |
2010年 | 4篇 |
2009年 | 3篇 |
2008年 | 5篇 |
2007年 | 1篇 |
2006年 | 3篇 |
2005年 | 7篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
排序方式: 共有128条查询结果,搜索用时 31 毫秒
1.
R. A. Cherkasov V. I. Galkin N. G. Khusainova O. A. Mostovaya A. R. Garifzyanov G. Kh. Nuriazdanova N. S. Krasnova E. A. Berdnikov 《Russian Journal of Organic Chemistry》2005,41(10):1481-1484
New and previously known β-aminoethylphosphonates were synthesized by addition of primary and secondary amines to vinylphosphonates, and their IR and NMR spectra were examined. Diethyl 2-diethylaminoethylphosphonate and diethyl 2-morpholinoethylphosphonate were found to be stronger bases than the corresponding aminomethylphosphonates, but all these are weaker bases than their precursors, nonphosphorylated amines. Distribution constants of β-aminophosphonates between water and some organic solvents were determined and compared with those of their α-amino homologs. 相似文献
2.
A. R. Garifzyanov N. V. Shirshova R. A. Cherkasov 《Russian Journal of General Chemistry》2005,75(4):537-540
Transport of some inorganic acids (HCl, HBr, HClO4, HNO3, H2SO4, and H2PO4) through hydrophobic impregnated membranes with aminophosphoryl compounds of the general formula R
2
1
P(O)CH2 ⋅ NR2R3 [R1 = C4H9(C2H5)CHCH2O, R2 = C4H9, R3 = C8H17; R1 = R3 = C8H17, R2 = H; R1 = C10H2, R2 = R3 = C2H5; R1 = C10H21, R2 + R3 = (CH2)2O(CH2)2; R1 = C8H17, R2 = H, R3 = 2-quinolyl] and dodecylamine as carriers was studied. The membrane phases were solutions of the carriers in phenylcyclohexane and tridecane. General regularities that correlate the structure of an aminophosphoryl compounds to its transport properties toward inorganic acids were established. The largest flows are characteristic of perchloric, nitric, and hydrobromic acids.__________Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 4, 2005, pp. 575–578.Original Russian Text Copyright © 2005 by Garifzyanov, Shirshova, Cherkasov. 相似文献
3.
A. R. Garifzyanov G. Kh. Nuriazdanova S. V. Zakharov R. A. Cherkasov 《Russian Journal of General Chemistry》2004,74(12):1885-1889
Two-phase potentiometric titration was used to determine partition constants for a series of -aminophosphonates (RO)2P(O)CH2NR1R2 [R = Alk (C2-C5), R1, R2 = Me, Et, (CH2)5] between water and organic solvents, such as chloroform, carbon tetrachloride, toluene, octane, n-octanol, nitrobenzene, o-xylene, and cyclohexane. Correlations between the partition constants and the number of carbon atoms in substrate molecules were obtained. Solvent effects on partition constants were discussed, and solution parameters of -aminophosphonates were calculated.Translated from Zhurnal Obshchei Khimii, Vol. 74, No. 12, 2004, pp. 1998–2002.Original Russian Text Copyright © 2004 by Garifzyanov, Nuriazdanova, Zakharov, Cherkasov.This revised version was published online in April 2005 with a corrected cover date. 相似文献
4.
Zakharov S. V. Nuriazdanova G. Kh. Garifzyanov A. R. Galkin V. I. Cherkasov R. A. 《Russian Journal of General Chemistry》2004,74(6):873-881
-Aminophosphoryl compounds of the phosphonate, phosphine oxide, and ,-bis(phosphine oxide) series and some of their thiophosphoryl analogs were synthesized. Potentiometric measurements of the pKa of the conjugate acids revealed an insignificant effect of variation of substituents on the phosphorus, nitrogen, and -carbon atoms on the basicity of the phosphorylated amines. The latter are weak bases. Organophosphorus groups decrease the basicity of the amines by almost 5 pK
a units. The role of the hydrophobic effect and intramolecular H-bonding in the obtained substances was discussed. 相似文献
5.
6.
7.
8.
Garifzyanov A. R. Chibirev E. O. Cherkasov M. R. Cherkasov R. A. 《Russian Journal of General Chemistry》2016,86(12):2723-2724
Russian Journal of General Chemistry - 相似文献
9.
R. A. Cherkasov A. R. Garifzyanov N. V. Kurnosova E. V. Matveeva I. L. Odinets 《Russian Chemical Bulletin》2012,61(1):174-180
The highly efficient synthesis of β-aminophosphoryl compounds with one and two ethylphosphoryl groups was performed by the addition of amines to the vinylphosphoryl compounds in water as a solvent. The acid-base properties and membrane-transport abilities of the target compounds towards carboxylic acids were studied. Selectivity towards acetic acid was revealed. 相似文献
10.
Arthur R. Tulyabaev Airat R. Tuktarov Leonard M. Khalilov 《Magnetic resonance in chemistry : MRC》2014,52(1-2):3-9
Using gauge‐invariant atomic orbital PBE/3ζ quantum chemistry approach, 13C NMR chemical shifts and diastereotopic splittings of sp2 fullerenyl carbons of a number of sulfur homofullerenes and methanofullerenes have been predicted and discussed. An anisochrony of fullerene carbons is caused by a chiral center of attached moieties. Clearly distinguishable diastereotopic pairs (from 8 to 11) of fullerenyl carbons of homofullerenes were observed. Unambiguous assignments of 13C NMR chemical shifts were performed, and diastereotopic splittings of methanofullerenes were observed for α, β and γ to a functionalization site. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献