Pyridinium dichromate
Pyridinium dichromate (CAS: 20039-37-6), with the chemical formula C10H10N2 · H2Cr2O7 and a molecular weight of 376.20 g/mol, is a potent oxidizing agent. It is primarily utilised in organic synthesis for specific oxidation reactions, such as the conversion of primary alcohols to aldehydes and secondary alcohols to ketones. Its precise reactivity makes it a valuable reagent in chemical research and development.
- IUPAC
- PDC

Oxidation of Alcohols
Pyridinium dichromate serves as an effective oxidizing agent for the conversion of primary alcohols to aldehydes and secondary alcohols to ketones. This transformation is crucial in various synthetic pathways in organic chemistry.
Synthesis of Enones
It facilitates the oxidation of didehydroketones to enones, a valuable transformation for accessing unsaturated carbonyl compounds. This application is particularly useful in complex molecule synthesis.
Chemical Synthesis Reagent
As a versatile synthetic reagent, Pyridinium dichromate is employed in diverse chemical transformations, contributing to the development of novel compounds and materials in research laboratories.
| Molecular weight | 376.20 |
|---|---|
| Empirical formula | C10H10N2 · H2Cr2O7 |
| Assay | 98% |
| Application | Oxidizing agent for conversion of primary alcohols to aldehydes and ketones,1 acetals to esters,2 and didehydroketones to enones3 in the presence of tert-butyl hydroperoxide (cat. no. 213128). |
| Melting point | 152-153 °C(lit.) |





Hazard statements
- H228Flammable solid
- H272May intensify fire; oxidiser
- H314Causes severe skin burns and eye damage
- H350I
- H410Very toxic to aquatic life with long-lasting effects
Precautionary statements
- P201Obtain special instructions before use
- P210Keep away from heat, sparks and open flames. No smoking
- P220Keep away from clothing and combustible materials
- P273Avoid release to the environment
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 1479 5.1/PG 2 |
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | O,F,T,N |
| Risk statements (R) | 49-8-11-34-50/53 |
| Safety statements (S) | 53-26-36/37/39-45-60-61 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Pyridinium dichromate used for?
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Pyridinium dichromate is primarily used as an oxidizing agent in organic synthesis for the conversion of primary alcohols to aldehydes, secondary alcohols to ketones, and for the synthesis of enones from didehydroketones.
What is the CAS number and formula for Pyridinium dichromate?
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The CAS number for Pyridinium dichromate is 20039-37-6, and its chemical formula is C10H10N2 · H2Cr2O7.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Pyridinium dichromate with a minimum purity of 98%. We do not represent this product as USP, BP, or EP grade.
How should Pyridinium dichromate be handled safely?
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Pyridinium dichromate is a dangerous substance that can cause severe skin burns and eye damage. It is flammable and may cause or intensify fire; oxidizer. It is also suspected of causing cancer by inhalation and is very toxic to aquatic life with long lasting effects. Always handle with appropriate personal protective equipment, including eyeshields, faceshields, gloves, and a suitable respirator, in a well-ventilated area.
Is Pyridinium dichromate available for export?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including Pyridinium dichromate, adhering to all relevant international shipping regulations.
How can I request a sample or quote for Pyridinium dichromate?
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To request a sample or a quote for Pyridinium dichromate, please use the 'Request a Quote' or 'Sample Request' form on our website, providing the product name and CAS number.
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