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[reaction: see text] Aromatic amines were obtained efficiently from enamines by using a catalytic amount of Pd/C in the presence of nitrobenzene and 4 A molecular sieves in refluxing toluene. 相似文献
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Nicolas Gillaizeau-Simonian Dr. Etienne Barde Dr. Amandine Guérinot Prof. Janine Cossy 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(12):4004-4008
A cobalt-catalyzed 1,4-aryl migration/disulfonylation cascade applied to α-bromo N-sulfonyl amides was developed. The reaction was highly chemoselective, allowing the preparation of α-aryl amides possessing a variety of functional groups. The method was used as the key step to synthesize an alkaloid, (±)-deoxyeseroline. Mechanistic investigations suggest a radical process. 相似文献
45.
An enantioselective synthesis of the piperidine alkaloids (+)-sedamine and (-)-prosophylline is reported. The synthesis of (+)-sedamine has been achieved in 12 steps with an overall yield of 20% from benzaldehyde, and (-)-prosophylline was obtained in 15 steps with an overall yield of 9.2%, starting from D-glyceraldehyde acetonide 14. The key steps are enantioselective allyltitanation reactions and ring-closing or cross-metathesis reactions. 相似文献
46.
Sarah HisChristophe Meyer Janine Cossy Gibert EmericAlfred Greiner 《Tetrahedron letters》2003,44(47):8581-8584
In the presence of trifluoroacetic acid, ketoxime benzyl carbonates undergo a Beckmann rearrangement to the corresponding amides. This reaction was translated to a solid support by immobilizing oximes in the form of mixed carbonates derived from hydroxymethylpolystyrene in order to produce a diversity of amides with high efficiency. 相似文献
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[structure: see text] A sequence of chemoselective cross-metathesis reactions and enantioselective allyltitanations of aldehydes has been used to prepare the C1-C13, C15-C26, and C27-C40 fragments of tetrafibricin. 相似文献
49.
Rhodium‐Catalyzed Cyclization of O,ω‐Unsaturated Alkoxyamines: Formation of Oxygen‐Containing Heterocycles 下载免费PDF全文
Julien Escudero Prof. Véronique Bellosta Prof. Janine Cossy 《Angewandte Chemie (International ed. in English)》2018,57(2):574-578
O,ω‐Unsaturated N‐tosyl alkoxyamines undergo unexpected RhIII‐catalyzed intramolecular cyclization by oxyamination to produce oxygen‐containing heterocycles. Mechanistic studies show that an aziridine intermediate seems to be responsible for the formation of the heterocycles, possibly via a RhV species. 相似文献
50.
Ring Contraction of 3‐Hydroxy‐3‐(trifluoromethyl)piperidines: Synthesis of 2‐Substituted 2‐(Trifluoromethyl)pyrrolidines 下载免费PDF全文
Alexandra Feraldi‐Xypolia Dr. Domingo Gomez Pardo Prof. Janine Cossy 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(37):12876-12880
A ring contraction of 3‐hydroxy‐3‐(trifluoromethyl)piperidines was achieved via an aziridinium intermediate. This contraction facilitates the synthesis of a series of 2‐substituted 2‐(trifluoromethyl)pyrrolidines incorporating a quaternary center at the C2 position. 相似文献