全文获取类型
收费全文 | 716篇 |
免费 | 0篇 |
专业分类
化学 | 670篇 |
力学 | 1篇 |
数学 | 12篇 |
物理学 | 33篇 |
出版年
2017年 | 3篇 |
2016年 | 4篇 |
2013年 | 29篇 |
2012年 | 21篇 |
2011年 | 23篇 |
2010年 | 33篇 |
2009年 | 26篇 |
2008年 | 25篇 |
2007年 | 25篇 |
2006年 | 21篇 |
2005年 | 21篇 |
2004年 | 26篇 |
2003年 | 19篇 |
2002年 | 21篇 |
2001年 | 26篇 |
2000年 | 14篇 |
1999年 | 25篇 |
1998年 | 26篇 |
1997年 | 15篇 |
1996年 | 19篇 |
1995年 | 11篇 |
1994年 | 18篇 |
1993年 | 7篇 |
1992年 | 7篇 |
1991年 | 5篇 |
1990年 | 7篇 |
1989年 | 5篇 |
1988年 | 12篇 |
1987年 | 20篇 |
1986年 | 12篇 |
1985年 | 9篇 |
1984年 | 12篇 |
1983年 | 13篇 |
1982年 | 12篇 |
1981年 | 6篇 |
1980年 | 4篇 |
1979年 | 10篇 |
1978年 | 7篇 |
1977年 | 9篇 |
1976年 | 5篇 |
1975年 | 8篇 |
1974年 | 12篇 |
1973年 | 12篇 |
1972年 | 8篇 |
1971年 | 19篇 |
1970年 | 9篇 |
1969年 | 6篇 |
1968年 | 4篇 |
1967年 | 8篇 |
1966年 | 7篇 |
排序方式: 共有716条查询结果,搜索用时 203 毫秒
601.
M. I. Kabachnik L. S. Zakharov E. I. Goryunov P. V. Petrovskii T. M. Schcherbina A. P. Laretina 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-4)
Abstract The phosphorylation of tertiary alcohols can be performed only in some exceptional cases. We established, that phosphorylation of tertiary fluoroalkanols H(CF2) nCMe2OH (I, n = 2,4) with aryl- and polyfluoroalkyl-phosphorodicnlor-idates or aryl- and alkylphosphonic dichlorides in the presence of metal of metal salt catalysts yields chloroan-hydrides (II) and (III). When benzyl phosphorochloridates (IV) are used as phosphorylating agents, either products of phosphorylation or products of alkylation are formed depending on the nature of the substituent in the aromatic ring. 相似文献
602.
O. V. Gusev A. M. Kal'sin T. A. Peganova P. V. Petrovskii G. P. Belov E. V. Novikova 《Russian Chemical Bulletin》2000,49(6):1113-1115
The properties of the ruthenium (II) phosphine complexes [Ru(dppe)2(OTs)2] and [Ru{PhP(CH2CH2CH2PPh2)2}(OTs)2] as catalysts of alternating copolymerization of ethylene and carbon monoxide were studied. The catalytic activity of these
complexes in the absence of cocatalysis is low, but it is substantially increased in the presence of trifluoroacetic acid
or 1,4-benzoquinone. These compounds are the first ruthenium complexes which catalyze copolymerization of ethylene and CO.
Translated fromAkademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1119–1121, June, 2000. 相似文献
603.
604.
Ivanov D. M. Kuklin S. A. Polezhaev A. V. Petrovskii P. V. Smol’yakov A. F. Dolgushin F. M. Ezernitskaya M. G. Peregudov A. S. Koridze A. A. 《Russian Chemical Bulletin》2009,58(8):1701-1706
Resorcinol-based ruthenium bis(phosphinite) complexes were synthesized. Complexes RuCl(CO)[2,6-(But
2PO)2C6H3] (9) and RuH(CO)[2,6-(But
2PO)2C6H3] (10) were obtained by cyclometallation of 1,3-(But
2PO)2C6H3 with RuCl2(DMSO)4 in 2-methoxyethanol in the presence of Hünig’s base. The interconversion of complexes 9 and 10 was studied. The addition of carbon monoxide to complexes 9 and 10 yielded 18e adducts, RuCl(CO)2[2,6-(But
2PO)2C6H3] (11) and RuH(CO)2[2,6-(But
2PO)2C6H3] (12), respectively. In the case of complex 9, this reaction is reversible. Reaction of complex 10 with trifluoroacetic acid resulted in complex Ru(CF3COO)(CO)[2,6-(But
2PO)2C6H3] (13), which reacted with carbon monoxide to give complex Ru(CF3COO)(CO)2[2,6-(But
2PO)2C6H3] (14). Based on the IR spectral data, the TFA ligand in complexes 13 and 14 is bound in a bi- and monodentate fashion, respectively. The structure of compound 9 was determined by X-ray diffraction analysis. 相似文献
605.
S. K. Petrovskii V. V. Saraev P. B. Kraikivskii N. S. Gurinovich D. A. Matveev V. V. Bocharova 《Russian Chemical Bulletin》2013,62(6):1323-1326
The formation of two types of paramagnetic species in the catalytic system NiBr2(DAB)/ MAO under real catalytic conditions was found. These are NiII are NiI complexes with the diimine ligand and complexes with the radical anion ligand in the coordination sphere. Under catalysis conditions, these forms are in equilibrium with each other, the equilibrium being shifted towards the radical anion form upon substrate addition. 相似文献
606.
Irene L. Odinets Natalya M. Vinogradova Konstantin A. Lyssenko Pavel V. Petrovskii Tatyana A. Mastryukova 《Heteroatom Chemistry》2000,11(2):163-170
Intramolecular cyclization of bis(3‐chloropropyl)‐diethoxythiophosphorylacetonitrile 7, taking place under distillation in vacuo, yields 6‐cyano‐2‐oxa‐10‐thia‐1‐phosphabicyclo[4.4.0]decane‐1‐oxide 10 as a mixture of cis and trans isomers in a 2.3:1 ratio. The isomers were separated chromatographically. For both isomers, single crystals with nonequivalent enantiomeric ratios were obtained under crystallization. The structures of both isomers of bicyclophostone 10 are confirmed by X‐ray study of single crystals. © 2000 John Wiley & Sons, Inc. Heteroatom Chem 11:163–170, 2000 相似文献
607.
Egor M. Baranovskii Victoria V. Khistiaeva Konstantin V. Deriabin Stanislav K. Petrovskii Igor O. Koshevoy Ilya E. Kolesnikov Elena V. Grachova Regina M. Islamova 《Molecules (Basel, Switzerland)》2021,26(22)
This study focuses on the synthesis of hybrid luminescent polysiloxanes and silicone rubbers grafted by organometallic rhenium(I) complexes using Cu(I)-catalyzed azido-alkyne cycloaddition (CuAAC). The design of the rhenium(I) complexes includes using a diimine ligand to create an MLCT luminescent center and the introduction of a triple C≡C bond on the periphery of the ligand environment to provide click-reaction capability. Poly(3-azidopropylmethylsiloxane-co-dimethylsiloxane) (N3-PDMS) was synthesized for incorporation of azide function in polysiloxane chain. [Re(CO)3(MeCN)(5-(4-ethynylphenyl)-2,2′-bipyridine)]OTf (Re1) luminescent complex was used to prepare a luminescent copolymer with N3-PDMS (Re1-PDMS), while [Re(CO)3Cl(5,5′-diethynyl-2,2′-bipyridine)] (Re2) was used as a luminescent cross-linking agent of N3-PDMS to obtain luminescent silicone rubber (Re2-PDMS). The examination of photophysical properties of the hybrid polymer materials obtained show that emission profile of Re(I) moiety remains unchanged and metallocenter allows to control the creation of polysiloxane-based materials with specified properties. 相似文献
608.
609.
S. V. Timofeev I. A. Lobanova A. R. Kudinov V. I. Meshcheryakov O. L. Tok P. V. Petrovskii F. M. Dolgushin Z. A. Starikova V. I. Bregadze 《Russian Chemical Bulletin》2000,49(9):1598-1604
Mercuration and bromination reactions of ferracarborane 3-(η5-Cp)-4-SMe2-3,1,2-FeC2B9H10 (1) were investigated. Mercuration of 1 under mild conditions (mercury trifluoroacetate in dichloromethane) results in 8-monosubstituted
mercury derivative as the only reaction product. Depending on the reaction conditions, bromination of 1 results in 8-mono-
or 7,8-disubstituted bromo derivatives. The structures of the monomercury and dibromo derivatives of 1 were established by
X-ray analysis.
Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1609–1615, September, 2000. 相似文献
610.
A. R. Kudinov V. I. Meshcheryakov P. V. Petrovskii M. I. Rybinskaya 《Russian Chemical Bulletin》1999,48(9):1794-1795
The reactions of the complex (η-9-Me2S-7,8-C2B9H10)Rh(η-cod) (cod is 1,5-cyclo-octadiene) with HX acids (X=Cl, Br, or I) in acetone afforded rhodacarborane halide complexes
[(η-9-Me2S-7,8-C2B9H10)RhX2]2, which are carborane analogs of cyclopentadienyl halide rhodium complexes [(η-C5R5)RhX2]2.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1817–1819, September, 1999. 相似文献