Enol ethers and a process for their preparation and...

Details Enol ethers and a process for their preparation and... Enol ethers and a process for their preparation and...

C - Chemistry, Metallurgy

07

C

260/480.4, 260/4

C07C 69/734 (2006.01) C07D 309/38 (2006.01)

Patent

CA 1274536

Enol ethers ant a process for thelr preparation Abstract of the Disclosure Alkoxymethyleneaconitic acid triesters of formula I Image (I) wherein R1, R2, R3 and R4 are each independently unsubstituted or substituted aliphatic hydrocarbon raticals, can be obtained by reacting aconitic acid triesters with formates in the presence of TiCl4, a tertiary amine and a complexing solvent Enol ethers of formula I can be cyclised ln the presence of strong anhydrous acids, in a manner which is known per se, to 2-oxo-2H-pyran- 4,5-ticarboxylic acid diesters of formula V Image (V), The pyrones of formula V are intermediates for the synthesis of organiccompounds ant can be used for example as diene components in Diels-Alder reactions.

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