全文获取类型
收费全文 | 431篇 |
免费 | 21篇 |
专业分类
化学 | 403篇 |
晶体学 | 10篇 |
数学 | 5篇 |
物理学 | 34篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 11篇 |
2020年 | 11篇 |
2019年 | 5篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 6篇 |
2015年 | 16篇 |
2014年 | 10篇 |
2013年 | 21篇 |
2012年 | 31篇 |
2011年 | 27篇 |
2010年 | 18篇 |
2009年 | 12篇 |
2008年 | 26篇 |
2007年 | 30篇 |
2006年 | 21篇 |
2005年 | 24篇 |
2004年 | 26篇 |
2003年 | 13篇 |
2002年 | 11篇 |
2001年 | 5篇 |
2000年 | 12篇 |
1999年 | 5篇 |
1998年 | 6篇 |
1997年 | 2篇 |
1996年 | 6篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1991年 | 8篇 |
1990年 | 13篇 |
1989年 | 10篇 |
1988年 | 14篇 |
1987年 | 10篇 |
1986年 | 3篇 |
1985年 | 6篇 |
1984年 | 2篇 |
1969年 | 1篇 |
排序方式: 共有452条查询结果,搜索用时 9 毫秒
121.
Dupuy S Lazreg F Slawin AM Cazin CS Nolan SP 《Chemical communications (Cambridge, England)》2011,47(19):5455-5457
A recently isolated gold(I) complex, [Au(IPr)(OH)], permits the transformation of carboxylic acids to the corresponding decarboxylated gold(I)-aryl complex without the use of silver co-catalyst under mild reaction conditions. 相似文献
122.
Alexandros Perivolaris Athena M. Fidelli Ross Inglis Vadim G. Kessler Alexandra M.Z. Slawin 《Journal of Coordination Chemistry》2014,67(23-24):3972-3986
In an attempt to employ salicylic acid (HOsalH), 2,6-dihydroxy benzoic acid {(HO)2PhCO2H}, and naphthalene-1,8-dicarboxylic acid {1,8-naph(CO2H)2} in Mn(III) salicylaldoximate chemistry as a means to alter the structural identity of the hexanucluear clusters usually obtained from this reaction system, we have isolated a family of hexanuclear Mn(III) complexes based on salicyladloxime (saoH2) and 2-hydroxy-1-naphthaldehyde oxime (naphthsaoH2). Five hexanuclear clusters, [Mn6O2(sao)6(HOsal)2(EtOH)4]·EtOH (1·EtOH), [Mn6O2(sao)6{1,8-naph(CO2Me)(CO2)}2(MeOH)6]·3MeOH (2·3MeOH), [Mn6O2(naphthsao)6{1,8-naph(CO2Et)(CO2)}2(EtOH)6] (3·2MeOH), [Mn6O2(naphthsao)6(MeCO2)2(EtOH)4]·2H2O (4·2H2O), and [Mn6O2(naphthsao)6{(HO)2PhCO2}2(EtOH)4]·4EtOH (5·4EtOH), have been synthesized and characterized by single-crystal X-ray crystallography. The magnetic properties of 3, 4, and 5 are discussed. 相似文献
123.
Stereochemical Assignment of the Protein–Protein Interaction Inhibitor JBIR‐22 by Total Synthesis 下载免费PDF全文
Alan R. Healy Dr. Miho Izumikawa Prof. Alexandra M. Z. Slawin Dr. Kazuo Shin‐ya Prof. Nicholas J. Westwood 《Angewandte Chemie (International ed. in English)》2015,54(13):4046-4050
Recent reports have highlighted the biological activity associated with a subfamily of the tetramic acid class of natural products. Despite the fact that members of this subfamily act as protein–protein interaction inhibitors that are of relevance to proteasome assembly, no synthetic work has been reported. This may be due to the fact that this subfamily contains an unnatural 4,4‐disubstitued glutamic acid, the synthesis of which provides a key challenge. A highly stereoselective route to a masked form of this unnatural amino acid now enabled the synthesis of two of the possible diastereomers of JBIR‐22 and allowed the assignment of its relative and absolute stereochemistry. 相似文献
124.
125.
[structure: see text]The methyl ester of the naturally occurring macrocyclic pentapeptide stephanotic acid, containing an unusual beta-substituted alpha-amino acid with a tryptophan C-6 to leucine beta-carbon link, has been synthesized. The key steps include the formation of this amino acid through a thioxo-oxazolidine intermediate and a Horner-Wadsworth-Emmons reaction using a phosphonoglycine, derived by a dirhodium(II)-catalyzed N-H insertion reaction, to give a dehydroamino acid and subsequent rhodium(I)-catalyzed asymmetric hydrogenation to introduce the modified tryptophan residue. 相似文献
126.
Synthesis and Elaboration of All‐cis‐1,2,4,5‐Tetrafluoro‐3‐Phenylcyclohexane: A Polar Cyclohexane Motif 下载免费PDF全文
Dr. Alastair J. Durie Dr. Tomoya Fujiwara Rodrigo Cormanich Prof. Michael Bühl Prof. Alexandra M. Z. Slawin Prof. David O'Hagan 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(21):6259-6263
A stereocontrolled synthesis of all‐cis‐1,2,4,5‐ tetrafluoro‐3‐phenylcyclohexane is developed as the first functionalised example of this polar cyclohexane motif. The dipolar nature of the ring, arising due to two 1,3‐diaxial C?F bonds, is revealed in the solid‐state (X‐ray) structure. The orthogonal conformation of the aryl and cyclohexyl rings in all‐cis‐1,2,4,5‐tetrafluoro‐3‐phenylcyclohexane, and in an ortho‐nitro derivative, result in intramolecular 1hJHF and 2hJCF NMR couplings relayed through hydrogen bonding. The aryl group of all‐cis‐1,2,4,5‐tetrafluoro‐3‐phenylcyclohexane is elaborated in different ways to demonstrate the versatility of this compound for delivering the motif to a range of molecular building blocks. 相似文献
127.
Alexandra M. Z. Slawin Martin B. Smith 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):481-484
Abstract Reaction of [Ph2P(E)NP(E)Ph2]? (E = S or Se) with a series of late transition-metal dimers, in thf or MeOH, leads to facile bridge cleavage and formation of new mononuclear compounds. 相似文献
128.
129.
130.
Özge Pala Dirk J Vriens Jac AM Vennix 《The Journal of the Operational Research Society》2015,66(4):593-601
Escalation of commitment, the tendency of decision makers to keep on investing in losing courses of action, has been shown to be a costly decision bias that affects many areas of decision making. Even though escalation is a widely studied phenomenon, there has been comparatively little research on how to avoid this bias. The present study focuses on de-escalation of commitment and proposes that causal loop diagrams (CLDs) can help to decrease escalating commitment to a failing course of action. By means of an experiment, this study shows that using a CLD decreases escalation tendencies. 相似文献