Mechanism of hydride transfer reaction from 4-(dimethylamino)phenyl methane derivatives to 2,3-dichloro-5,6-dicyano-p-benzoquinone

Shunzo Yamamoto, Tetsuo Sakurai, Liu Yingjin, Yoshimi Sueishi

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The kinetics of the hydride-transfer reactions from bis[4- (dimethylamino)phenyl] methane (MH2), bis[4(dimethylamino)phenyl] methoxy methane (MHOMe), Leuco Malachite Green (MGH) and Leuco Crystal Violet (CVH) to 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) have been investigated spectrophotometrically by means of the stopped-flow technique. The negative activation enthalpies were obtained for the hydride-transfer reactions from MH2, MHOMe and MGH to DDQ in dichloromethane. These negative activation enthalpies suggest that the charge-transfer (CT) complexes are true intermediates in the hydride-transfer reactions from these donors to DDQ, as previously pointed out for MH2-DDQ system in trichloroethane. The formation of charge-transfer complexes between MH2, MHOMe, MGH and CVH and p-chloranil (CA) were observed in EPA (ethylether-pentane-ethanol) at low temperatures. The oxidation potential (E(ox)/°) of MHOMe, MGH and CVH were estimated using the linear correlation between the CT transition energy and the E(ox)/°value for the known CT complexes between CA and N,N-dimethylaniline derivatives. The rates were found to be correlated to the E(ox)/°values of the donors.

Original languageEnglish
Pages (from-to)833-837
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume1
Issue number5
DOIs
Publication statusPublished - Mar 1 1999

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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