Pyridinium dichromate
- CAS No.
- 20039-37-6
- Chemical Name:
- Pyridinium dichromate
- Synonyms
- PDC;Escat? 11;Escat? 103;Cat.20569-9;C5H5NH+)2Cr2O72-;Cornforth reagent;PYRIDINE DICHROMATE;PYRIDINIUM DICHROMATE;PyridiniumDichromate>PyridiniuM dichroMate 98%
- CBNumber:
- CB4390259
- Molecular Formula:
- C5H7Cr2NO7
- Molecular Weight:
- 297.1
- MDL Number:
- MFCD00013105
- MOL File:
- 20039-37-6.mol
- MSDS File:
- SDS
- TDS File:
- TDS
| Melting point | 152-153 °C(lit.) |
|---|---|
| Density | 1.71[at 20℃] |
| vapor pressure | 0Pa at 25℃ |
| storage temp. | Inert atmosphere,Room Temperature |
| 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℃ |
| CAS DataBase Reference | 20039-37-6(CAS DataBase Reference) |
| FDA UNII | Y7AV7UFN7K |
| EPA Substance Registry System | Chromic acid (H2Cr2O7), compd. with pyridine (1:2) (20039-37-6) |
| UNSPSC Code | 12352005 |
| NACRES | NA.22 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |       GHS02,GHS03,GHS05,GHS07,GHS08,GHS09 |
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|---|---|---|---|---|---|---|---|---|---|---|
| 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 | |||||||||
| PPE | Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges | |||||||||
| Hazard Codes | O,T,N,Xn,F,Xi | |||||||||
| Risk Statements | 49-8-43-50/53-61-60-46-45-20/21/22-40-36/37/38-34-11 | |||||||||
| Safety Statements | 53-45-60-61-37-29-24-17-36/37/39-27-22-26 | |||||||||
| RIDADR | UN 1479 5.1/PG 2 | |||||||||
| WGK Germany | 2 | |||||||||
| F | 3 | |||||||||
| TSCA | TSCA listed | |||||||||
| 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 |
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| REACH Registrations | Active | |||||||||
| Limited Quantities | 1.0 kg (2.2 lbs) (solid) | |||||||||
| Excepted Quantities | Max Inner Pack (30g or 30ml) and Max Outer Pack (500g or 500ml) | |||||||||
| NFPA 704 |
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Pyridinium dichromate price More Price(60)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | 214698 | Pyridinium dichromate 98% | 20039-37-6 | 100g | $97.4 | 2026-04-30 | Buy |
| Sigma-Aldrich | 214698 | Pyridinium dichromate 98% | 20039-37-6 | 500g | $156 | 2026-04-30 | Buy |
| TCI Chemical | P0931 | Pyridinium Dichromate >98.0%(T) | 20039-37-6 | 25g | $17 | 2026-04-30 | Buy |
| TCI Chemical | P0931 | Pyridinium Dichromate >98.0%(T) | 20039-37-6 | 100g | $43 | 2026-04-30 | Buy |
| Usbiological | 287288 | Pyridinium dichromate Asreported | 20039-37-6 | 1kg | $865 | 2026-06-03 | Buy |
Pyridinium dichromate Chemical Properties,Uses,Production
Chemical Properties
Orange solid
Uses
Pyridinium dichromate (PDC) 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.
Pyridinium Dichromate may be used as an alternative to PCC in nucleoside and carbohydrate oxidation, particularly for fragile molecules. PDC can also be used in conjunction with tertbutylhydroperoxide for a variety of oxidative transformations.
Uses
Pyridinium dichromate acts as a strong oxidizing agent used in the conversion of primary alcohols and secondary alcohols to aldehydes and ketones respectively. It plays an important role in the oxidation of unsaturated tertiary alcohols, silyl ethers, the carbon-boron bond, and oximes. Further, it is used in the conversion of acetals to esters and didehydroketones to enones in the presence of tert-butyl hydroperoxide.
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.
Pyridinium dichromate Preparation Products And Raw materials
Raw materials
Preparation Products
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Wuhan Roche Technology Development Co., Ltd., | 18986168071; 18986168071 | 18986168071@163.com | China | 95 | 55 |
| J & K SCIENTIFIC LTD. | 18210857532 18210857532 | jkinfo@jkchemical.com | China | 96815 | 76 |
| Meryer (Shanghai) Chemical Technology Co., Ltd. | 4006356688 18621169109 | market03@meryer.com | China | 40202 | 62 |
| Alfa Aesar | 400-6106006 | saleschina@alfa-asia.com | China | 30103 | 84 |
| TCI (Shanghai) Development Co., Ltd. | 021-67121386 | Sales-CN@TCIchemicals.com | China | 24512 | 81 |
| Energy Chemical | 400-0056266 | sales8178@energy-chemical.com | China | 44850 | 61 |
| Capot Chemical Co., Ltd | +86 (0) 571 85 58 67 18 | China | 18187 | 66 | |
| Beijing Ouhe Technology Co., Ltd | 13552068683 13522913783 | 2355560935@qq.com | China | 11777 | 60 |
| JinYan Chemicals(ShangHai) Co.,Ltd. | 13817811078 | sales@jingyan-chemical.com | China | 9963 | 60 |
| Jia Xing Isenchem Co.,Ltd | 0573-85285100 18627885956 | isenchem@163.com | China | 9389 | 66 |
View Lastest Price from Pyridinium dichromate manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-07-21 | Pyridinium dichromate
20039-37-6
|
1g | 99% | 20 tons | Hubei Lidu New Material Technology Co., Ltd | ||
 |
2026-03-20 | Pyridinium dichromate
20039-37-6
|
$10.00 | 1KG | 99% | 10 mt | Hebei Chuanghai Biotechnology Co., Ltd | |
 |
2024-10-06 | Pyridinium dichromate
20039-37-6
|
$590.00 | 98 | 1000 Kg | R&D Scientific Inc. |
-
- Pyridinium dichromate
20039-37-6
- 99%
- Hubei Lidu New Material Technology Co., Ltd
-
- Pyridinium dichromate
20039-37-6
- $10.00
- 99%
- Hebei Chuanghai Biotechnology Co., Ltd
-
- Pyridinium dichromate
20039-37-6
- $590.00
- 98
- R&D Scientific Inc.
