CAS No:2127-03-9 2,2'-Dithiodipyridine|NSC 94055;1,2-Di(pyridin-2-yl)disulfane;Di(pyridin-2-yl) disulphide;Aldrithiol(TM)-2 98%;Bis(pyridin-2-yl) disulfide

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Product Name: 2,2'-Dithiodipyridine
Synonyms: NSC 94055;1,2-Di(pyridin-2-yl)disulfane;Di(pyridin-2-yl) disulphide;Aldrithiol(TM)-2 98%;Bis(pyridin-2-yl) disulfide
CAS No.: 2127-03-9
Molecular Formula: C10H8N2S2
Molecular Weight : 220.31
Specification : 98%
Place of Origin: China
Appearance :
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2,2'-Dithiodipyridine Chemical Properties

Melting point	56-58 °C(lit.)

density	1.3078 (rough estimate)

refractive index	1.5500 (estimate)

Fp	210 °C

storage temp.	2-8°C

solubility	methanol: soluble50mg/mL, clear to very slightly hazy, colorless to faintly brownish-yellow

form	powder

color	Clear colorless to yellow to tan

Water Solubility	5 g/L (20 ºC)

BRN	154629

CAS DataBase Reference	2127-03-9(CAS DataBase Reference)

NIST Chemistry Reference	Pyridine, 2,2'-dithiobis-(2127-03-9)



2,2'-Dithiodipyridine Usage And Synthesis

Chemical Properties	white 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 Methods	Recrystallise 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

Preparation Products	Finasteride

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