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  • 2-(&ohgr;-alkoxycarbonyl alkanoyl)-4-butanolide
    Patent number: 6222049
    Abstract: 2-(&ohgr;-alkoxycarbonyl alkanoyl)-4-butanolide is produced with a high selectivity and yield through condensation reaction of Y-butyrolactone with a readily available, low-price dicarboxylate as represented by the following general formula: ROOC(CH2)nCOOR wherein n denotes an integer of 8-13, and R denotes an alkyl group or an alkenyl group.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: April 24, 2001
    Assignees: Toray Industries, Soda Aromatic Co., Ltd.
    Inventors: Tetsuya Katou, Go Hata, Takeaki Etoh, Nobuhiko Ito
  • Method for producing 2-(.omega.-alkoxycarbonyl alkanoyl)-4-butanolide and a long-chain .omega.-hydroxycarboxylic acid
    Patent number: 5808106
    Abstract: 2-(.omega.-alkoxycarbonyl alkanoyl)-4-butanolide can be produced unexpectedly with a high selectivity and yield through condensation reaction of .gamma.-butyrolactone with a highly available, lo.omega.-price dicarboxylate as represented by the following general formula:ROOC(CH2)nCOOR(where n denotes an integer of 7-13, and R denotes an alkyl group or an alkenyl group). Furthermore, a long-chain .omega.-hydroxycarboxylic acid can be produced by subjecting 2-(.omega.-alkoxycarbonyl alkanoyl)-4-butanolide to hydrolysis and decarboxylation and reducing the carbonyl groups in the resultant product into methylene groups.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: September 15, 1998
    Inventors: Tetsuya Katou, Go Hata, Takeaki Etoh, Nobuhiko Ito