Process for preparing 3-methyl-2-butene-4-olide(4-...

Details Process for preparing 3-methyl-2-butene-4-olide(4-... Process for preparing 3-methyl-2-butene-4-olide(4-...

C - Chemistry, Metallurgy

07

D

260/366.6

C07D 307/32 (2006.01) C07D 307/58 (2006.01) C07D 315/00 (2006.01)

Patent

CA 1239411

Process for Preparing 3-Methyl-2-butene-4-olide (4-Methyl-2(5H)-furane-2-one) Abstract of the Disclosure The invention relates to a process for preparing 3-methyl-2-butene-4-olide by the codimerization of methylenecyclopropane with carbon dioxide (CO2) in the presence of organic complex compounds of transition metals, which process is characterized in that the codimerization is carried out at a temperature of 100°C to 200°C in the pre- sence of palladium(0) compounds which are stable in the reaction mixture up to 200°C and with CO2 under a pressure of 10 to 110 bar, optionally in the presence of a solvent.

473297

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