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Electrochemical oxidn. of alkyl-pyridine(s) to carboxylic acids - in cell with anion exchange membrane, acid anolyte and more dilute acid catholyte
Electrochemical oxidn. of alkyl-pyridine(s) to carboxylic acids - in cell with anion exchange membrane, acid anolyte and more dilute acid catholyte
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机译:电化学氧化。阴离子交换膜,酸性阳极电解液和更多稀酸性阴极电解液中的烷基吡啶对羧酸的合成
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摘要
Electrochemical oxidn. of an alkylpyridine of formula (I) is effected in an acid medium at a Pb-contg. anode of an electrolytic cell, with anode and cathode compartments sepd. by an anion-exchange membrane. As catholyte, an aq. soln. of the same acid as used for the anolyte but in relatively dilute form is used. The prod. is recovered from the anolyte. R=1-6C alkyl; n=1, 2 or 3. The acid used is pref. H2SO4, with 10-50 wt.% acid in the anolyte and 0.1-5 wt.% in the catholyte. The anion-exchange membrane is pref. non-porous, and has a high degree of selectivity for the transfer of monovalent anions. (I) is typically alpha- or beta-picolines, 2,3- or 2,6-lutidines or 2-ethyl-5-methylpyridine to give respectively, picolinic, nicotinic, 2,3-, 2,6- or 2,5-pyridinedicarboxylic acids.
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机译:电化学氧化。式(I)的烷基吡啶的制备在酸性介质中以Pb-contg进行。电解池的阳极,阳极室和阴极室分隔。通过阴离子交换膜。作为阴极液,水溶液。 soln。使用与阳极电解液相同的酸,但使用相对稀的形式。产品。从阳极液中回收。 R = 1-6C烷基; n = 1、2或3。使用的酸是优选的。 H2SO4,在阳极电解液中有10-50 wt。%的酸,在阴极电解液中有0.1-5 wt。%。阴离子交换膜是优选的。无孔的,对单价阴离子的转移具有高度的选择性。 (I)通常是α-或β-甲基吡啶,2,3-或2,6-二甲基吡啶或2-乙基-5-甲基吡啶,分别得到吡啶甲酸,烟碱,2,3-,2,6-或2, 5-吡啶二羧酸。
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