全文获取类型
收费全文 | 60篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
化学 | 42篇 |
力学 | 1篇 |
数学 | 5篇 |
物理学 | 14篇 |
出版年
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2015年 | 2篇 |
2014年 | 1篇 |
2013年 | 3篇 |
2012年 | 1篇 |
2011年 | 5篇 |
2009年 | 1篇 |
2008年 | 3篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 5篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有62条查询结果,搜索用时 0 毫秒
11.
Radiotracer experiments show that self-diffusion in the rotator crystalline phase of adamantane proceeds by a vacancy mechanism. The results are in good agreement with those determined from NMR experiments. 相似文献
12.
13.
14.
Lo Fiego MJ Badajoz MA Silbestri GF Lockhart MT Chopa AB 《The Journal of organic chemistry》2008,73(22):9184-9187
The exceptional leaving group ability of the trimethylstannyl group in electrophilic aromatic substitutions makes possible the synthesis, in a single step, of bi- and triaroylarenes through the catalyst-free, regioselective reaction of bi- and tristannylarenes with different aroyl halides in o-dichlorobenzene as solvent. Specific di- and triketones are obtained in good to excellent yields (45-83%). 相似文献
15.
Viviana B. Dorn María T. Lockhart Adriana B. Pierini 《Journal of organometallic chemistry》2008,693(14):2458-2462
The reaction of trimethyltinsodium (1) with 1-(diethoxyphosphoryl)oxy-1,3-cyclohexadienes in liquid ammonia under irradiation affords the corresponding 1-trimethylstannylcyclohexadienes. We suggest that these reactions occur by an SRN1 mechanism. On the other hand, 2-(diethoxyphosphoryl)oxy-1,3-cyclohexadiene reacts very slowly towards 1 and the substitution product decomposes under the reaction conditions employed. Thus, structurally similar compounds do not behave in the same way under ET conditions. We suggest that this behavior is mainly due to differences in spin density of their radical anions, which affect their fragmentation rates. Our results are supported by computational calculations. 相似文献
16.
17.
Abstract Two trithiamacrocycles have been designed by molecular modelling to have preorganised endodentate sulfur donor atoms. These new macrocycles have five- and six-membered saturated heterocycles inserted into 2,5,8-trithia[9]-m-benzenophane; molecular dynamics simulations suggest that the endo forms will be rigid on a nanosecond timescale. Optimum metal-sulfur distances which the new ligands will accommodate lie between 2.76 Å and 2.95 Å, suggesting they will be particularly suitable for a large soft metal ion such as silver(I). 相似文献
18.
19.
Pablo M. Fidelibus Gustavo F. Silbestri María T. Lockhart Sandra D. Mandolesi Alicia B. Chopa Julio C. Podestá 《应用有机金属化学》2007,21(8):682-687
In this paper we describe a three‐step synthesis of aryldi‐ and triboronic acids starting from phenols. Several substituted phenols (I) were converted into the corresponding aryldiethylphosphates (II) in good to excellent yields. The latter, on reaction with sodium trimethylstannide in liquid ammonia, under irradiation, afforded the aryl‐ and heteroarylpoly(trimethylstannyl) derivatives in 65–90% yield. The third step is the reaction of the organotin compounds with borane in THF, which leads to the corresponding arylpolyboronic acids in around 80% yield. In order to confirm their structure, some of the diboronic acids were converted into the corresponding pinacol esters. The results obtained in a study on the synthesis of various terphenyls through double and triple Suzuki couplings catalyzed by palladium acetate between the obtained arylpolyboronic acids and various aryl halides are also reported. These reactions proceeded with an average 65% yield, and also enabled us to confirm the structures of some of the diboronic acids. The structure of the new compounds was determined by 1H, 13C and 119Sn NMR spectroscopy, mass spectrometry and IR spectroscopy. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
20.
Deng H Cobb SL Gee AD Lockhart A Martarello L McGlinchey RP O'Hagan D Onega M 《Chemical communications (Cambridge, England)》2006,(6):652-654
The fluorinase enzyme from S. cattleya is applied as a catalyst for the efficient incorporation of [18F]-fluoride into [18F]-5'-fluoro-5'-deoxyadenosine, [18F]-5'-fluoro-5'-deoxyinosine and [18F]-5-fluoro-5-deoxyribose for positron emission tomography (PET) applications. 相似文献