piperidines has been researched along with dicyanmethane* in 3 studies
3 other study(ies) available for piperidines and dicyanmethane
| Article | Year |
|---|---|
Enaminones as building blocks in heterocyclic syntheses: reinvestigating the product structures of enaminones with malononitrile. A novel route to 6-substituted-3-oxo-2,3-dihydropyridazine-4-carboxylic acids.
The reported structures of reaction products of enaminones with malononitrile in ethanolic piperidine are revised. A novel route to 2,3-dihydropyridazine-4-carboxylic acids 4a-c via reactions of 2-cyano-5-(dimethylamino)-5-arylpenta-2,4-dienamides 8a-c with nitrous acid or with benzenediazonium chloride is reported. Compounds 8a-c are converted to 1,2-dihydropyridine-3-carboxylic acid and 1,2-dihydropyridine-3-carbonitrile derivatives upon reflux in EtOH/ HCl and in AcOH. Topics: Carboxylic Acids; Ethanol; Nitriles; Piperidines; Pyridazines | 2008 |
Piperidine as an efficient organic catalyst of derivatization of oligosaccharides with malononitrile for high-sensitivity electrospray ionization mass analysis.
Topics: Catalysis; Ions; Models, Chemical; Nitriles; Oligosaccharides; Piperidines; Spectrometry, Mass, Electrospray Ionization; Time Factors | 2001 |
Manual and semiautomated spectrophotometric determination of vitamin K3 by reactions wih piperidine and malononitrile.
Simple, rapid, selective, and sensitive spectrophotometric methods are described for manual and semiautomated determination of vitamin K3. These methods are based on reactions with piperidine and malononitrile whereby intense red and blue colors with maximum absorption at 510 nm (E(1%) 1 cm 150) and 580 nm (E(1%) 1 cm 155), respectively, are developed. The reactions are sensitive enough to permit the determination of 2-100 micrograms vitamin K3/mL with an average recovery of 98% and a standard deviation of 1%. There is no interference from vitamin K1 and K2, and the reduced forms of K vitamins, or from many common pharmaceutical diluents and additives. Topics: Autoanalysis; Chemical Phenomena; Chemistry; Methane; Nitriles; Piperidines; Spectrophotometry; Vitamin K | 1981 |