| 摘要 |
PURPOSE: To obtain the subject compound useful as a solvent for photosensitive resins or various polymers in high yield under mild conditions by reacting an α-hydroxycarboxylic acid ester with a dlalkyl carbonate on a solid acid catalyst. CONSTITUTION: An (z-hydroxycarboxylic acid ester of formula I (R<1> and R<2> are each H, a carboalkoxy, cyano, an alkyl, an allyl or an aryl; R<3> is an alkyl, an allyl or an aryl) is reacted with a dialkyl carbonate of formula II (R<4> is an alkyl or an aryl) on a solid acid catalyst to thereby afford an α- alkoxycarboxylic acid ester of formula III. α-Hydroxyisobutyric acid and lactic acid esters are especially preferred as the a α-hydroxycarboxylic acid ester. Dimethyl carbonate and diethyl carbonate are especially preferred as the dialkyl carbonate. A silica-alumina-based catalyst is preferred as the solid acid catalyst and zeolite at a ratio of Si/Al within the range of 1-5 is especially preferred. |
