| Identification | More | [Name]
Pyridinium dichromate | [CAS]
20039-37-6 | [Synonyms]
PDC
PYRIDINIUM DICHROMATE
chromicacid(h2cr2o7),compd.withpyridine(1:2)
PYRIDINE DICHROMATE
Pyridinium dichromate, on cross-link polystyrene, 2.0m mol/g
Pyridinium dichromate, on cross-linked polystyrene, 2.0m mole/g
Chromic acid compound with pyridine (1:2)
Cornforth reagent | [EINECS(EC#)]
243-478-8 | [Molecular Formula]
C10H12Cr2N2O7 | [MDL Number]
MFCD00013105 | [Molecular Weight]
376.2 | [MOL File]
20039-37-6.mol |
| Chemical Properties | Back Directory | [Appearance]
Orange solid | [Melting point ]
152-153 °C(lit.)
| [density ]
1.71[at 20℃] | [vapor pressure ]
0Pa at 25℃ | [storage temp. ]
Store at RT. | [solubility ]
soluble in DMSO | [form ]
Crystalline Powder | [color ]
Orange to brown | [Water Solubility ]
soluble | [Sensitive ]
Hygroscopic | [Exposure limits]
OSHA: Ceiling 0.1 mg/m3
NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3 | [InChI]
1S/2C5H5N.2Cr.2H2O.5O/c2*1-2-4-6-5-3-1;;;;;;;;;/h2*1-5H;;;2*1H2;;;;;/q;;2*+1;;;;;;;/p-2 | [InChIKey]
BNSOYWDFFBDEFB-UHFFFAOYSA-L | [SMILES]
c1ccncc1.c2ccncc2.O[Cr](=O)(=O)O[Cr](O)(=O)=O | [LogP]
-3.7 at 20℃ | [Uses]
Pyridinium dichromate is an orange colored solid used as an oxidizing agent.
Oxidizing agent for conversion of primary alcohols to aldehydes and ketones, acetals to esters, and didehydroketones to enones in the presence of tert-butyl hydroperoxide. | [CAS DataBase Reference]
20039-37-6(CAS DataBase Reference) | [EPA Substance Registry System]
20039-37-6(EPA Substance) |
| Safety Data | Back Directory | [Symbol(GHS) ]
     
GHS02,GHS03,GHS05,GHS07,GHS08,GHS09 | [Signal word ]
Danger | [Hazard statements ]
H228-H272-H314-H317-H350i-H410 | [Precautionary statements ]
P210-P260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338 | [Hazard Codes ]
O,T,N,Xn | [Risk Statements ]
R49:May cause cancer by inhalation.
R8:Contact with combustible material may cause fire.
R43:May cause sensitization by skin contact.
R50/53:Very Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment .
R61:May cause harm to the unborn child.
R60:May impair fertility.
R45:May cause cancer.
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed .
R40:Limited evidence of a carcinogenic effect.
R36/37/38:Irritating to eyes, respiratory system and skin . | [Safety Statements ]
S53:Avoid exposure-obtain special instruction before use .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S60:This material and/or its container must be disposed of as hazardous waste .
S61:Avoid release to the environment. Refer to special instructions safety data sheet .
S37:Wear suitable gloves .
S29:Do not empty into drains .
S24:Avoid contact with skin .
S17:Keep away from combustible material .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S27:Take off immediately all contaminated clothing .
S22:Do not breathe dust . | [RIDADR ]
UN 1479 5.1/PG 2
| [WGK Germany ]
2
| [F ]
3 | [TSCA ]
Yes | [REACH Registrations]
Active | [HazardClass ]
5.1 | [PackingGroup ]
II | [HS Code ]
29333100 | [Storage Class]
4.1A - Other explosive hazardous materials | [Hazard Classifications]
Aquatic Acute 1
Aquatic Chronic 1
Carc. 1B Inhalation
Eye Dam. 1
Flam. Sol. 1
Skin Corr. 1B
Skin Sens. 1 |
| Hazard Information | Back Directory | [Chemical Properties]
Orange solid | [Definition]
ChEBI: Pyridinium dichromate is a pyridinium salt that is the dipyridinium salt of dichromic acid. It is a strong oxidizing agent which can convert primary and secondary alcohols to aldehydes and ketones respectively. It has a role as an oxidising agent. It contains a dichromate(2-). | [Preparation]
Pyridinium dichromate can be obtained by gradual addition of a solution of chromic anhydride (Cr2O3) in water to pyridine in ice cold conditions.
| [Flammability and Explosibility]
Flammable | [reaction suitability]
reagent type: oxidant | [Purification Methods]
Dissolve it in the minimum volume of H2O and add 5 volumes of cold Me2CO and cool to -20o. After 3hours the orange crystals are collected, washed with a little cold Me2CO and dried in a vacuum. It is soluble in dimethylformamide (0.9g/mL at 25o), and in H2O, and has a characteristic IR with max at 930, 875, 765, 730 and 730 cm-1. [Corey & Schmidt Tetrahedron Lett 399 1979, Coats & Corrigan Chem Ind (London) 1594 1969.] (Possible CARCINOGEN.) § Available commercially on a polymer support. |
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