Search results for " Deriva"
showing 10 items of 718 documents
Die molekularen Konstanten von Polycarbonaten in Lösung
1959
An einer Reihe von fraktionierten Polycarbonaten werden in zwei Losungsmitteln die Diffusions- und Sedimentationskonstanten, die Viskositatszahlen, die osmotischen Drucke sowic die Lichtstreuung gemessen. Daraus wird eine Eichkurve zur viskosimetrischen Molekulargewichtsbestimmung abgeleitet und aus einem Vergleich der verschidednen Mittelwerte des Molekulargewichts die Uneinheitlichkeit der Fraktionen abgeschatzt. Aus den Reibungs-und Lichtstreuungsdaten werden die Knauelabmessungen berchnot und mit Hilfe der gemessenen zweiten Virialkoeffizientin auf das indifferente Losunmittal reduziert. Die Volumbeanspruchung der Polycarbonatmolekule in Losung ist groser als die vergleichbarer Polyviny…
ChemInform Abstract: Leaving Group and Regioselectivity Switches in the Aminoalkylation Reaction of Indoles and Related Heterocycles with α-Amido Sul…
2013
Two methods are presented which allow the regioselective C- or N-aminoalkylation of indoles, pyrroles or azaindoles.
Poly(amine) biphenyl derivatives as fluorescent sensors for anions and cations
2005
Four new ligands, derived from tetramethylbenzidine and containing additional amino groups, are described. The influence of pH on the fluorescent properties of these ligands has been studied, and the effect of the dihedral angle between the aromatic rings on the fluorescent response has been established. The behaviour of the new ligands, and that of others previously described in both the complexation and sensing of different anions and cations, are also described.
ChemInform Abstract: Indirect Regioselective Heteroarylation of Indoles Through a Friedel-Crafts Reaction with (E)-1,4-Diaryl-2-buten-1,4-diones.
2010
Abstract A two-step synthesis of 3-heteroaryl indoles has been developed. The first step of the sequence involves a Friedel–Crafts alkylation of indoles with 1,4-diaryl-2-buten-1,4-diones to give the corresponding indoles bearing a 1,4-dicarbonyl moiety. The reaction is catalyzed by InCl 3 and takes place with good yields. Cyclization of the diones under different Paal–Knorr conditions allows to prepare indoles substituted at the C3 position with 3-furanyl, 3-pyrrolyl- and 3-thienyl moieties.
ChemInform Abstract: THE PREPARATION OF DIHYDROXYDIPHENYLMETHANE DERIVATIVES CONTAINING NITRO GROUPS PART 1, SYMMETRICALLY SUBSTITUTED COMPOUNDS
1974
(1974). THE PREPARATION OF DIHYDROXYDIPHENYLMETHANE DERIVATIVES CONTAINING NITRO GROUPS. I. SYMMETRICALLY SUBSTITUTED COMPOUNDS. Organic Preparations and Procedures International: Vol. 6, No. 3, pp. 123-130.
Synthetic Strategies Towards O6-Substituted Guanine Derivatives and their Application in Medicine
2005
ChemInform Abstract: A Convenient and General Synthesis of Alkanediyl Diphenols.
2010
ChemInform Abstract: Pyrrolidino Enaminones Structurally Related to Gyrase Inhibitors: Synthesis, Cyclization and Pharmacological Activity.
2010
ChemInform Abstract: H2-Antihistaminics. Part 35. Synthesis and H2-Antagonistic Activity of Imidazolylmethylthioalkyl-Substituted 1,2,4-Triazoles.
1987
ChemInform Abstract: Synthesis of Amino-1,2,4-triazoles by Reductive ANRORC Rearrangements of 1,2,4-Oxadiazoles.
2011
The hydrazinolysis of the oxadiazoles under optimized conditions allows a general synthesis of functionalized aminotriazole products which are of interest due to the biological activity of the heterocyclic system.