Search results for "Derivative"
showing 10 items of 1074 documents
ChemInform Abstract: Microwave-Assisted Organocatalytic Enantioselective Intramolecular Aza-Michael Reaction with α,β-Unsaturated Ketones.
2012
The combination of an epi-hydroquinine catalyst and pentafluoropropionic acid accelerates the process.
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.
Synthesis, Molecular Structure, and Reactivity of Rhodium(I) Complexes with Diazoalkanes and Related Substrates as Ligands
2003
A series of (diazoalkane)rhodium(I) compounds of the general composition trans-[RhCl(N2CRR‘)(PiPr3)2] with R = R‘ = Ph, p-C6H4Me, p-C6H4Cl and R = Ph, R‘ = p-C6H4Me, o-C6H4Me, CH3, CH2Ph, CF3 has been prepared from the dimer [RhCl(PiPr3)2]2 (1) and the diazoalkane. This preparative route has also been extended to complexes in which the N2C unit(s) of 1,4-C6H4{C(Ph)N2}2, 9-diazofluorene, 9,10-anthraquinone-9-diazide, and 3-methyl-1,4-naphthoquinone-1-diazide is (are) linked to a 14-electron [RhCl(PiPr3)2] fragment. While C(CO2Et)2N2 behaves as expected and affords upon treatment with 1 the complex trans-[RhCl{N2C(CO2Et)2}(PiPr3)2), CH(CO2Et)N2 reacts with the same starting material to give t…
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.