Molecules 1998, 3(6), 149-158; doi:10.3390/30600149
Article

Synthesis and Reactions of New 4-Oxo-4H-benzopyran-3-carboxaldehydes Containing Hydroxy Groups or 2-Oxopyran Cycles

1,* email, 1, 1, 2 and 3
Received: 27 January 1998; Accepted: 14 April 1998 / Published: 15 May 1998
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: 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.
Keywords: 3-Formylchromones; Vilsmeier - Haack reaction; 2-oxobenzopyrane; imines; enamines; AM1 calculations
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MDPI and ACS Style

Lacova, M.; Loos, D.; Furdik, M.; Matulova, M.; El-Shaaer, H.M. Synthesis and Reactions of New 4-Oxo-4H-benzopyran-3-carboxaldehydes Containing Hydroxy Groups or 2-Oxopyran Cycles. Molecules 1998, 3, 149-158.

AMA Style

Lacova M, Loos D, Furdik M, Matulova M, El-Shaaer HM. Synthesis and Reactions of New 4-Oxo-4H-benzopyran-3-carboxaldehydes Containing Hydroxy Groups or 2-Oxopyran Cycles. Molecules. 1998; 3(6):149-158.

Chicago/Turabian Style

Lacova, Margita; Loos, Dusan; Furdik, Mikulas; Matulova, Maria; El-Shaaer, Hafez M. 1998. "Synthesis and Reactions of New 4-Oxo-4H-benzopyran-3-carboxaldehydes Containing Hydroxy Groups or 2-Oxopyran Cycles." Molecules 3, no. 6: 149-158.

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