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2,2'-Dithiodipyridine

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2,2'-Dithiodipyridine Basic information
2,2'-Dithiodipyridine Chemical Properties
  • Melting point:56-58 °C(lit.)
  • Boiling point:356.1±17.0 °C(Predicted)
  • Density 1.3078 (rough estimate)
  • refractive index 1.5500 (estimate)
  • Flash point:210 °C
  • storage temp. 2-8°C
  • solubility methanol: soluble50mg/mL, clear to very slightly hazy, colorless to faintly brownish-yellow
  • form powder
  • pka1.52±0.19(Predicted)
  • color Clear colorless to yellow to tan
  • Water Solubility 5 g/L (20 ºC)
  • BRN 154629
  • InChIKeyHAXFWIACAGNFHA-UHFFFAOYSA-N
  • CAS DataBase Reference2127-03-9(CAS DataBase Reference)
  • NIST Chemistry ReferencePyridine, 2,2'-dithiobis-(2127-03-9)
  • EPA Substance Registry SystemPyridine, 2,2'-dithiobis- (2127-03-9)
Safety Information
MSDS
2,2'-Dithiodipyridine Usage And Synthesis
  • Chemical Propertieswhite to yellowish crystalline powder
  • Uses 2,2'-Dipyridyldisulfide, sometimes known as DPS, is used for preparing thiols and activating or protecting carboxylic acid with triphenylphosphine.
  • Purification MethodsRecrystallise the disulfide H2O from *C6H6/pet ether (6:7), ligroin or *C6H6. The picrate has m 119o (from EtOH). [Walter et al. Justus Liebigs Ann Chem 695 7785 1966, Marckwald et al. Chem Ber 33 1556 1900, Brocklehurst & Little Biochem J 133 67,78 1973, Beilstein 21 III/IV 48.] It has been used as a 1mM solution in EtOH for the spectrophotometric estimation of thiols. Essentially the thiol displaces half the disulfide molecule liberating the 2-mercaptopyridine anion, thereby shifting the from 340nm (of the disulfide) to 268nm (of the anion) at pH 9, or 278nm in H2O. (Compare
2,2'-Dithiodipyridine Preparation Products And Raw materials
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