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Polycyclic Systems (polycyclic + system)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

ChemInform Abstract: Isoxazole-Assisted Direct Substitution of the Hydroxy Group in ,-Ketols: Introduction of Angular Substituents in a Polycyclic System.

CHEMINFORM, Issue 16 2009
Hiroshi Takikawa
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: Transformations of C-Adducts of 1,4-Diazinium Salts with Dicarbonyl Compounds into Polycyclic Systems.

CHEMINFORM, Issue 29 2009
E. V. Verbitskiy
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Facile and Versatile Route to the Synthesis of Fused 2-Pyridones: Useful Intermediates for Polycyclic Systems.

CHEMINFORM, Issue 36 2006
Barbara Cacciari
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]

Cyclohexenones as Michael Acceptors in the Staunton,Weinreb Annulation: A Simple Stannane Modification for the Synthesis of Polycyclic Systems.

CHEMINFORM, Issue 12 2006
Bryan Hill
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]

Silaaromaticity in Polycyclic Systems: A Computational Study.

CHEMINFORM, Issue 20 2003
D. Manjula Dhevi
No abstract is available for this article. [source]

Two-Step Electrochemical Annulation for the Assembly of Polycyclic Systems.

CHEMINFORM, Issue 11 2003
Christopher R. Whitehead
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

rac -9-Ethyl-12a-hydroxytetradecahydrotriphenylene-1,5(2H,4bH)-dione: stabilization of a new isomer of a functionalized perhydrotriphenylene through a tandem Michael addition,aldol reaction

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 6 2008
Luis Arturo García
The title compound, C20H30O3, is a new functionalized perhydrotriphenylene derivative formed via a tandem Michael addition,aldol reaction. The structural study reveals that the system of fused rings approximates a C2 point symmetry, with trans,cis,cis ring junctions, while highly symmetric all- trans perhydrotriphenylene, previously characterized, approximates a D3 symmetry. The perhydrotriphenylene nucleus of the title compound corresponds to the third stable stereoisomer isolated for this polycyclic system. Considering that the Cs isomer was obtained recently through a similar tandem reaction, a general strategy is proposed which may help to obtain other stable stereoisomers of perhydrotriphenylene. [source]

The Intramolecular Aromatic Electrophilic Substitution of Aminocyclopropanes Prepared by the Kulinkovich,de Meijere Reaction,

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 21 2005
Laurent Larquetoux
Abstract This article describes new examples of intramolecular Kulinkovich,de Meijere reactions applied to carboxylic amides bearing an olefin moiety and an aromatic ring at a suitable position. Upon heating, the aminocyclopropanes thus obtained undergo intramolecular aromatic electrophilic substitution to afford polycyclic systems. Among the various starting materials prepared, best results are obtained from indole and phenol derivatives. In each case, a benzylic quaternary centre is introduced at the newly-formed ring junction. On one example, the efficiency of the cyclisation has been dramatically improved using a catalytic amount of para -toluenesulfonic acid. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005) [source]