间接电氧化合成山梨酸前体乙酰氧基己烯酸

Electro-synthesis of sorbic acid precursor acetoxyhexanoic acid

在醋酸 醋酐体系中 ,在石墨电极上Mn(Ⅱ )电解氧化生成Mn(Ⅲ )的最佳工艺条件为 :电解时间 1h ,电解温度 90℃ ,电流密度 5mA/cm2 ,电解液组成为 0 1mol/LMn(OAc) 2 ·4H2 O ,1 5mol/LKOAc以及V(HOAc)∶V(Ac2 O) =1∶3 ,电流效率大于80 %。再通过Mn(Ⅲ )氧化有丁二烯存在的醋酸 醋酐体系 ,丁二烯的浓度范围在 0 2 5～ 1 0 0mol/L ,温度 90℃ ,反应时间 5h ,得到山梨酸前体乙酰氧基己烯酸。

The optimal conditions of anode oxidizing Mn(II) to Mn(III) on graphite electrode in HOAc-Ac2O system were following: electrolyzed at 90°C for 1 h with 0.1 mol/L Mn(OAc)2&middot4H2O, 1.5 mol/L KOAc and V(HOAc): V(AC2O) = 1:3, and the current efficiency is more than 80%. Then the sorbic acid precursor acetoxyhexanoic acid were produced from butadiene oxidized by Mn(III) that produced in former step. The second reaction processed under 90°C for 5 h with butadiene concentration 0.25 ∼ 1.00 mol/L.