ChemInform Abstract: SYNTHESIS OF PYRANS, PYRONES AND PYRIDONES BY MICHAEL CONDENSATION WITH CINNAMALACETOPHENONE

Abstract

Michael‐Reaktion der Titelverbindungen (I) mit den Carbonylverbindungen (II) liefert die Addukte (IIIa)‐(IIIc); aus diesen sind die Heterocyclen (IV), (V), (VI) bzw. (VII) erhältlich . Die Pyrone (X) können direkt aus (I) gewonnen werden.

Synthesis, electronic spectra, and solvatochromic behaviour of 4-arylidene-1-(2,4-dinitrophenyl)-3-methyl-2-pyrazolin-5-ones

“…As these compounds are used in the preparation of cyanine dyes, they may be used as photosensitizers (3,4). Some literature concerning the synthesis (5,6) and electronic spectra (7) of pyrazolines is reported. However, data on the synthesis and electronic spectra of the title compounds are yet scarce in the literature.…”