申请人:——
公开号:US20040024228A1
公开(公告)日:2004-02-05
A process of the present invention produces a hydroxylactone by subjecting an unsaturated carboxylic acid having a double bond not conjugated to a carboxyl group or an ester thereof to (i) a reaction with hydrogen peroxide in the presence of a metallic compound containing a metallic element selected from W, Mo, V and Mn or (ii) a reaction with a peroxide containing the metallic element to thereby yield a corresponding hydroxylactone having a hydroxyl group combined with one of carbon atoms constituting the double bond and being cyclized at the other carbon atom position. The metallic compound may be one selected from oxides, oxoacids and salts thereof. The unsaturated carboxylic acid includes, for example, &bgr;,&ggr;-unsaturated carboxylic acids, &ggr;,&dgr;-unsaturated carboxylic acids, and &dgr;,&egr;-unsaturated carboxylic acids. The process can produce hydroxylactones in high yields at low cost.
本发明的过程通过将具有未与羧基共轭的双键的不饱和羧酸或其酯与(i)含有W、Mo、V和Mn中选择的金属元素的金属化合物存在下的过氧化氢反应或(ii)与含有金属元素的过氧化物反应,从而得到具有羟基与构成双键的碳原子之一结合并在另一个碳原子位置环化的相应羟基内酯。金属化合物可以是从氧化物、氧酸和盐中选择的一种。不饱和羧酸包括例如β,γ-不饱和羧酸、γ,δ-不饱和羧酸和δ,ε-不饱和羧酸。该过程可以以低成本高产率生产羟基内酯。