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Octane Derivatives (octane + derivative)
Selected AbstractsVerbenone in the Synthesis of o-Menth-1-en-3-one and 5,7,7-Trimethylazabicyclo[4.1.1.]octane Derivatives.CHEMINFORM, Issue 3 2007S. S. Koval'skaya 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] Synthesis and Evaluation of the Antitrypanosomal and Antiplasmodial Activities of New 4-Aminobicyclo[2.2.2]octane Derivatives.CHEMINFORM, Issue 5 2006Werner Seebacher Abstract For Abstract see ChemInform Abstract in Full Text. [source] Radical Cascade Reaction with 1,4-Dienes and 1,4-Enynes Using 2-(Iodomethyl)cyclopropane-1,1-dicarboxylate as a Homoallyl Radical Precursor: One-Step Synthesis of Bicyclo[3.3.0]octane Derivatives.CHEMINFORM, Issue 35 2002Osamu Kitagawa Abstract For Abstract see ChemInform Abstract in Full Text. [source] Inter-ring and endo anomeric effects, and hydrogen-bonded supramolecular motifs in two 2,4,6,8-tetraazabicyclo[3.3.0]octane derivativesACTA CRYSTALLOGRAPHICA SECTION C, Issue 4 2009Zhenfeng Zhang In 2,4,6,8-tetrakis(4-chlorophenyl)-2,4,6,8-tetraazabicyclo[3.3.0]octane, C28H22Cl4N4, the imidazolidine rings adopt envelope conformations, which are favoured by two equal endo anomeric effects. The molecule lies on a crystallographic twofold axis and molecules are linked into a three-dimensional framework via two C,H...Cl hydrogen bonds. In 2,4,6,8-tetrakis(4-methoxyphenyl)-2,4,6,8-tetraazabicyclo[3.3.0]octane, C32H34N4O4, one of the methyl groups is disordered over two sets of sites and the same methyl group participates in an intermolecular C,H...O hydrogen bond, which in turn causes a considerable deviation from the preferred conformation. There are two unequal inter-ring anomeric effects in the N,C,N groups. Molecules are linked into corrugated sheets by one C,H..., hydrogen bond and two independent C,H...O hydrogen bonds involving methoxy groups. [source] CH-Directed Anion,, Interactions in the Crystals of Pentafluorobenzyl-Substituted Ammonium and Pyridinium SaltsCHEMISTRY - A EUROPEAN JOURNAL, Issue 17 2010Markus Albrecht Prof. Abstract Simple pentafluorobenzyl-substituted ammonium and pyridinium salts with different anions can be easily obtained by treatment of the parent amine or pyridine with the respective pentafluorobenzyl halide. Hexafluorophosphate is introduced as the anion by salt metathesis. In the case of the ammonium salt 4, water co-crystallisation seems to suppress effective anion,, interactions of bromide with the electron-deficient aromatic system, whereas with salts 5 and 6 such interactions are observed despite the presence of water. However, due to asymmetric hydrogen-bonding interactions with ammonium side chains, the anion of 5 is located close to the rim of the pentafluorophenyl group (,1 interaction). In 6 the CH,anion hydrogen bonding is more symmetric and fixes the anion on top of the ring (,6). A similar structure-controlling effect is observed in case of the 1,4-diazabicyclo[2.2.2]octane derivatives 7. Here the position of the anion (Cl, Br, I) is shifted according to the length of the weak CH,halide interaction. The hexafluorophosphate 7,d reveals that this "non-coordinating" anion can be located on top of an aromatic , system. In the methyl-substituted pyridinium salts 9 and 10 different locations of the bromide anions with respect to the , system are observed. This is due to different conformations of the mono- versus disubstituted pyridine, which leads to different directions of the weak, but structurally important, HMeBr bonds. [source] | ||||||||||