茴香脑间接电氧化合成茴香醛

Indirect electrochemical oxidation of anethole to anisaldehyde

研究了在硫酸溶液中以Mn(Ⅱ)/Mn(Ⅲ)作为媒质,铅为阴极和阳极,在无隔膜电解槽中间接电化学氧化茴香脑合成茴香醛,讨论了电解反应条件对电解产率的影响。结果表明,以5.5 mol/L H2SO4+0.15 mol/LMn(Ⅱ)为电解液,控制电流密度为50 mA/cm2,电解温度为40℃,阴、阳极面积比为1∶6,电解2 h时,得到的Mn(Ⅲ)电解产率高达95.6%;以乙醚为溶剂,在50℃恒温搅拌且回流冷凝的条件下,用Mn(Ⅲ)氧化稍超过理论量的茴香脑,合成的茴香醛产率高达80.7%。

Indirect electrochemical oxidation of anethole to anisaldehyde was investigated in non-membrane electrolytic cell using Mn（ Ⅱ ）/Mn（ Ⅲ ） as redox mediator, and pure lead as cathode and anode in sulphuric acid solution. The effects of electrolysis conditions on the yield of Mn（ Ⅲ ） was particularly discussed. The result showed that using 5.5 moi/L sulfuric acid and 0.15 moL/L Mn（ Ⅱ ） solution as the electrolyte with the current density at 50 mA/cm^2, temperature at 40 ℃ and control the ratio of area of cathode to anode as 1 ： 6, electrolysis for 2 h, the electrolytic yield of Mn （Ⅲ ） reached 95.6%. Using Mn（ Ⅲ ） to oxidate anethole with quantity a little over than in theory, aether as solvent,whisk, circulate and condensate with constant temperature at 50 ℃, the yield of anisaldehyde reached 80.7%.