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- W2059291204 abstract "The ethyl ester of 5,5′-methylene-bis-salicyclic acid 3 was prepared by the esterification of 5,5′-methylene-bis-salicylic acid 2. The compound 3 on reacting with ethylacetoacetate yields 6,6′-methylenebis-(3-acetyl-4-hydroxycoumarin) 4. The compound 4 was regioselectively converted into either 8,8′-methylene-bis-(4-oxo-1H-chromeno[4,3-c]pyrazoles) 6 or 8,8′-methylene-bis(-4-oxo-2H-chromeno[4,3-c]-pyrazoles) 7 under microwave irradiation. High yields are achieved even on a gram scale, while reaction times are considerably shortened compared to conventional heating conditions." @default.
- W2059291204 created "2016-06-24" @default.
- W2059291204 creator A5041088323 @default.
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- W2059291204 date "2008-03-18" @default.
- W2059291204 modified "2023-09-22" @default.
- W2059291204 title "ChemInform Abstract: Rapid and Efficient Microwave Assisted Method for the Regioselective Synthesis of 8,8′-Methylene-bis-4-oxo-1H and 2H-Chromeno[4,3-c]pyrazoles." @default.
- W2059291204 cites W2952285322 @default.
- W2059291204 doi "https://doi.org/10.1002/chin.200812138" @default.
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