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US 3,947,519 AGranted
Preparation of optically active allethrorone via allethronyl acid phthalate
AssigneeSumitomo Chemical Company, Limited
InventorsMasanao Matsui, Fukashi Horiuchi, Hajime Hirai, Nobushige Itaya
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Abstract
The present invention relates to a process for preparing allethrolone which involves hydrolyzing 2-allyl-4-hydroxy-3-methyl-2-cyclopentenone acid phthalate represented by the formula ##SPC1## In water or an aqueous solvent with or without a base of less than a small excess of the equivalent.
Claims9
A method for preparing allethrolone, which comprises hydrolyzing 2-allyl-4-hydroxy-3-methyl-2-cyclopentenone acid phthalate represented by the formula ##SPC3##
- in water or an aqueous solvent consisting of water and a solvent selected from the group consisting of methanol, ethanol, glycerine, ethyleneglycol, diethyleneglycol, triethyleneglycol, acetate, tetrahydrofuran, dioxane, dimethylsulfoxide and dimethylformamide with or without a base of less than a small excess of the equivalent, said base being selected from the group consisting of alkali metal and alkali earth metal hydroxides, carbonates, bicarbonates, phosphates, cyanides, sulfides, borates, formates, acetates, propionates and benzoates, and amines and mixtures thereof.
Dependencies are inferred from the claim text.