Tempo-initiated oxidation of o-phenylenediamine to 2,3-diaminophenazine

József Kaizer, Róbert Csonka, Gábor Speier

Research output: Contribution to journalArticle

7 Citations (Scopus)


The oxidation reaction of o-phenylenediamine (PDA) to 2,3-diaminophenazine (DAP) initiated by 2,2,6,6-tetramethyl-1-piperidinyloxyl (TEMPO) has been investigated in methanol at ambient temperature. The oxidation of PDA was followed by electronic spectroscopy and the rate constants were determined according to the rate law -d[PDA]/dt = kobs[PDA][TEMPO]. The rate constant, activation enthalpy and entropy at 323 K are as follows: kobs (dm3 mol-1 s-1) = (3.60±0.13) × 10-6, Ea (kJ mol-1) = 76±11, ΔH‡ (kJ mol-1) = 74±10, ΔS‡ (J mol-1 K-1) = -122±31.

Original languageEnglish
Pages (from-to)367-374
Number of pages8
JournalReaction Kinetics and Catalysis Letters
Issue number2
Publication statusPublished - Dec 2 2002


  • O-Phenylenediamine oxidation
  • Phenoxazinone synthase
  • TEMPO catalysis

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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