Disclosed is the oxidation of uronic acids, such as galacturonic acid, to the corresponding aldaric acids (characterized by the formula HOOC-(CHOH)n-COOH, with n being an integer of from 1 to 5) such as galactaric acids. The starting material comprising the uronic acid is subjected to oxygen under the influence of a supported gold catalyst and in the presence of a base. The oxidation occurs in good selectivity and yield, under unexpectedly mild conditions. A source of galacturonic acids is pectin, such as that derived from sugar beet pulp.
揭示了对糖醛酸(如
半乳糖醛酸)的氧化反应,得到相应的糖醛酸(以HOOC-(CHOH)n-COOH的结构式表示,其中n为1至5的整数),如
半乳糖醛酸。将含有糖醛酸的起始物质在受支持的
金催化剂和碱的作用下暴露于
氧气中。该氧化反应在意外地温和条件下具有良好的选择性和产率。
半乳糖醛酸的来源之一是
果胶,如从甜菜渣中提取的
果胶。