| 摘要 |
PURPOSE:To obtain lactones with increased catalytic activity and improved stability thereof in good yield and high selectivity under mild condition, by hydrogenating a dicarboxylic acid, anhydride thereof, etc., in a homogeneous liquid phase using a specific catalyst and additive promoter thereof. CONSTITUTION:A dicarboxylic acid, anhydride and/or ester thereof, such as succinic acid or anhydride thereof, are hydrogenated in the liquid phase in the presence of a catalyst of ruthenium or a compound thereof, such as ruthenium acetylacetonate, an organic phosphine, such as trioctylphosphine, and an additive promoter of a metallic compound selected from groups IVA, VA and IIIB of the periodic table, such as zirconium hydroxyacetate or ammonium tetraoxoborate, as necessary, in a solvent, such as tetraglyme, at 50-250 deg.C under 0.1-100kg/cm<2> H2 partial pressure for 1-20hr in the case of a batch method to afford the aimed lactones, such as gamma-butyrolactone.
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