全文获取类型
收费全文 | 654篇 |
免费 | 58篇 |
国内免费 | 87篇 |
专业分类
化学 | 768篇 |
晶体学 | 8篇 |
综合类 | 2篇 |
物理学 | 21篇 |
出版年
2024年 | 1篇 |
2023年 | 10篇 |
2022年 | 38篇 |
2021年 | 41篇 |
2020年 | 44篇 |
2019年 | 18篇 |
2018年 | 25篇 |
2017年 | 16篇 |
2016年 | 34篇 |
2015年 | 29篇 |
2014年 | 36篇 |
2013年 | 85篇 |
2012年 | 25篇 |
2011年 | 28篇 |
2010年 | 19篇 |
2009年 | 19篇 |
2008年 | 27篇 |
2007年 | 32篇 |
2006年 | 24篇 |
2005年 | 30篇 |
2004年 | 25篇 |
2003年 | 34篇 |
2002年 | 86篇 |
2001年 | 18篇 |
2000年 | 12篇 |
1999年 | 5篇 |
1998年 | 1篇 |
1997年 | 6篇 |
1996年 | 4篇 |
1995年 | 5篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有799条查询结果,搜索用时 15 毫秒
101.
102.
A.Vijender ReddyK. Ravinder T.Venkateshwar GoudP. Krishnaiah T.V. RajuY. Venkateswarlu 《Tetrahedron letters》2003,44(33):6257-6260
Reaction of indoles with electron deficient olefins under the influence of bismuth triflate has been studied at ambient temperature and affords the corresponding 3-alkylated indoles in excellent yields. 相似文献
103.
以β-萘胺为原料,经重氮化,还原,成环,N-烷基化,缩合5步反应得到目标化合物苯并吲哚三甲川花菁染料,并住部分中间体和目标化合物合成步骤中运用了微波辐射法合成技术.该类化合物通过红外光谱(IR)、核磁共振氢谱(^1H NMR)、紫外可见光谱(UV)进行了表征.结果表明,微波辐射法与传统方法相比,反应时间缩短7.4~47倍,产率提高了5.1%~50.4%. 相似文献
104.
Indole alkaloids from the African Strychnos species, their antiplasmodial and cytotoxic action, and structure -activity relationships are discussed in the review 相似文献
105.
106.
Two new monoterpenoid indole alkaloids, tabervarines A (1) and B (2), along with seven known monoterpenoid indole alkaloids, were isolated from the methanol extract of the twigs and leaves of Tabernaemontana divaricata. The structures including the absolute configurations of the new alkaloids were elucidated based on MS, NMR, and ECD calculation. The in vitro cytotoxic activities of the isolated alkaloids against several human cancer cell lines were also evaluated. 相似文献
107.
The palladium‐catalyzed direct C2‐ and further C7‐acylation of indoles with aldehydes have been developed. This method provides a convenient pathway toward a variety of mono‐ and diacylated indoles. 相似文献
108.
An efficient,mild and selective Ullmann‐type N‐arylation of indoles catalysed by Pd immobilized on amidoxime‐functionalized mesoporous SBA‐15 as heterogeneous and recyclable nanocatalyst
下载免费PDF全文
![点击此处可从《应用有机金属化学》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A wide range of N‐arylated indoles were selectively synthesized through intermolecular C(aryl)? N bond formation from the corresponding aryl iodides and indoles through Ullmann‐type coupling reactions in the presence of a catalytic amount of Pd immobilized on amidoxime‐functionalized mesoporous SBA‐15 (SBA‐15/AO/Pd(0)) under mild reaction conditions. These cross‐coupled products were obtained in excellent yields under mild conditions at extremely low palladium loading (ca 0.3 mol%), and the heterogeneous catalyst can be readily recovered by simple filtration and reused seven times with loss in its activity. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
109.
Zhaohong Lu Ming Yang Pengxi Chen Xiaochun Xiong Prof. Dr. Ang Li 《Angewandte Chemie (International ed. in English)》2014,53(50):13840-13844
A unified and bioinspired oxidative cyclization strategy was used in the first total syntheses of naturally occurring 12‐epi‐hapalindole Q isonitrile, hapalonamide H, deschloro 12‐epi‐fischerindole I nitrile, and deschloro 12‐epi‐fischerindole W nitrile, as well as the structural revision of the latter. Hapalindoles H and Q were also synthesized. 相似文献
110.
Dirhodium(II) Carboxylate Catalyzed Formation of 1,2,3‐Trisubstituted Indoles from Styryl Azides
下载免费PDF全文
![点击此处可从《Angewandte Chemie (International ed. in English)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Crystalann Jones Quyen Nguyen Prof. Dr. Tom G. Driver 《Angewandte Chemie (International ed. in English)》2014,53(3):785-788
Dirhodium(II)‐carboxylate complexes were discovered to promote the selective migration of acyl groups in trisubstituted styryl azides to form 1,2,3‐trisubstituted indoles. The styryl azides are readily available in three steps from cyclobutanone and 2‐iodoaniline. 相似文献