%0 Journal Article
%T Synthesis and Reactions of New 4-Oxo-4H-benzopyran-3-carboxaldehydes Containing Hydroxy Groups or 2-Oxopyran Cycles
%A Margita Lacova
%A Dusan Loos
%A Mikulas Furdik
%A Maria Matulova
%A Hafez M. El-Shaaer
%J Molecules
%D 1998
%I MDPI AG
%R 10.3390/30600149
%X The synthesis of eight hydroxy- and 2-oxopyranochromone-3-carboxaldehydes 3, 5 and their reactions with 2-hydroxyaniline, 2,4-dinitrophenylhydrazine and 2-benzothiazolylhydrazine were investigated. Products were confirmed by IR, NMR spectral and elemental analysis data. The semi-empirical AM1 quantum-chemical method has been used to study optimal geometries and heats of formation of synthesized 3-formylchromones.
%K 3-Formylchromones
%K Vilsmeier - Haack reaction
%K 2-oxobenzopyrane
%K imines
%K enamines
%K AM1 calculations
%U http://www.mdpi.com/1420-3049/3/6/149