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Synthesis of Zwitterionic 4-Hydroxycoumarin Derivatives through a Unique Reaction of 4-Hydroxycoumarins with p- Benzoquinone and Pyridine

โœ Scribed by Zhang, Sheng-Ling; Huang, Zhi-Shu; An, Lin-Kun; Bu, Xian-Zhang; Ma, Lin; Li, Yue-Ming; Chan, Albert S. C.; Gu, Lian-Quan

Book ID
115505509
Publisher
American Chemical Society
Year
2004
Tongue
English
Weight
61 KB
Volume
6
Category
Article
ISSN
1523-7060

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Et 2 AlCl-Promoted Coupling Reactions of 4-Hydroxy-2-pyrone or 4-Hydroxycoumarin with Aldehydes: Synthesis of Methylenebis(4hydroxy-2-pyrone) or Methylenebis(4-hydroxycoumarin) Derivatives. -Condensation of pyrone derivatives (I) with aldehydes (II) in the presence of Et 2 AlCl easily affords the me