Process for the preparation of...

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C - Chemistry, Metallurgy

07

C

260/479.7, 260/5

C07C 49/707 (2006.01) C07C 45/51 (2006.01) C07C 49/395 (2006.01) C07C 69/74 (2006.01)

Patent

CA 1056848

ABSTRACT The disclosure relates to a novel process for the preparation of 3-alkyl-cyclopentane-1,2-diones and, in particular, to a novel process for the preparation of 3-methyl-cyclopentane-1,2-dione also known as Maple lactone. The process comprises condensation of esters of glutaric acid and oxalic acid in a polar aprotic solvent in the presence of an alkali metal alkoxide to form 3,5-dicarboalkoxy-cyclopentane-1,2-dione dialkali metal salts, alkylating said salts with an alkylating agent to form a 2-alkoxy- 3,5-dicarboalkoxy-5-alkyl-cyclopent-2-ene-1-one, removing said solvent therefrom, and hydrolyzing the remainder with a mineral acid to form a 3-alkyl-cyclopentane-1,2-dione.

215579

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