Tetrahedron

4, 6-dimethyl-2h, 8h-benzo [1, 2-b: 5, 4-b'] dipyran-2, 8-dione. formation of linear and angular isomers in the pechmann reaction

AG Osborne

Index: Osborne, A. G. Tetrahedron, 1983 , vol. 39, # 9 p. 1523 - 1528

Full Text: HTML

Citation Number: 9

Abstract

The structure of Hantzsch and Zürchers “dimethyldicoumarin” obtained from resorcinol or 7- hydroxy-4-methylcoumarin and ethylacetoacetate has been confirmed as the linear title compound 1. peri-Substituent effects in 1H and 13C NMR spectroscopy have been used to differentiate between the lin and ang isomers, the ang Me groups being deshielded. A set of rules to govern the formation of lin/ang isomers has been proposed.

Related Articles:

Establishing a Flow Process to Coumarin??8??Carbaldehydes as Important Synthetic Scaffolds

[Zak, Jaroslav; Ron, David; Riva, Elena; Harding, Heather P.; Cross, Benedict C. S.; Baxendale, Ian R. Chemistry - A European Journal, 2012 , vol. 18, # 32 p. 9901 - 9910]

A rapid approach for the copper, amine, and ligand-free Sonogashira coupling of 4-methyl-7-nonafluorobutylsulfonyloxy coumarins under microwave irradiation

[Joy, M. Nibin; Bodke, Yadav D.; Abdul Khader; Sajith, Ayyiliyath M. Tetrahedron Letters, 2014 , vol. 55, # 15 p. 2355 - 2361]

A rapid approach for the copper, amine, and ligand-free Sonogashira coupling of 4-methyl-7-nonafluorobutylsulfonyloxy coumarins under microwave irradiation

[Tetrahedron Letters, , vol. 55, # 15 p. 2355 - 2361]

Coumarins: Facile and Expeditious Synthesis via Keggin??Type Heteropolycompounds under Solvent??Free Condition

[Rafiee, Ezzat; Fakhri, Akram; Joshaghani, Mohammad Journal of Heterocyclic Chemistry, 2013 , vol. 50, # 5 p. 1121 - 1128]

Mild and efficient deprotection of allyl ethers of phenols and hydroxycoumarins using a palladium on charcoal catalyst and ammonium formate

[Ganguly, Nemai C.; Dutta, Sanjoy; Datta, Mrityunjoy Tetrahedron Letters, 2006 , vol. 47, # 32 p. 5807 - 5810]

More Articles...