Coulometric generation of hydrogen ions by anodic oxidation of some organic compounds in nitromethane, sulpholane, acetonitrile and acetic acid—acetic anhydride
✍ Scribed by R. Mihajlović; V. Vajgand; Z. Simić
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 616 KB
- Volume
- 265
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
The coulometnc generation of hydrogen ions by anodlc oxldatlon of cyclohexa-l,Cdlene, cyclohexa-1,3-dlene, 9,10-dlhydroanthracene, cyclohexene and 1,2,3,4_tetrahydronaphthalene m acetomtnle and acetlc acid-acetlc anhydrlde (1 + 6, v/v> IS described The coulometnc generatlon of protons by anodlc oxldatlon of 2,3,4-trihydroxybenzoolc acid, some dlhydnc and tnhydnc phenols and esters of galhc acid, m mtromethane and sulfolane as solvents IS also reported The current-potential curves recorded for these depolanzers, the titrated bases, Indicators and solvents showed that the mvestlgated depolanzers are oxldlzed at more negatwe potentials than the oxldatlon potentials of the titrated bases and other components present m the solution The generated hydrogen ions were used for the tltratlon of some organic bases (p-tolmdme, tnethanolamme, sodium acetate, potassmm hydrogenphthalate, pyndme, plpendme, tnbutylamme, colhdme and 2,2'-blpyndme) \rlth Msual and potentlometnc end-pomt detectlon The current efficiency was 100% for dlenes, 2,3,4-and 3,4,5-tnhydroxybenzolc acid, phenols and esters of galhc acid Keywords Coulometry, Potentlometry, TltrlmetIy, Hydrogen Ions, Orgamc bases Nltromethane IS a protogemc solvent which exhibits weak acid-base properties (pK, = 10 6 m water) As an acid, it can be titrated wrth sodmm methylate m butylamme [l] and with tetrabutylamrnomum hydroxide m pyrldme as solvent [2] In sulphurlc acid it behaves as a base [31 Although It has a relatively high dlelectrlc constant