Collins reagent

Collins reagent is the complex of chromium(VI) oxide with pyridine in dichloromethane. This metal-pyridine complex, a red solid, is used to oxidize primary alcohols to the corresponding aldehydes and secondary alcohols to the corresponding ketones. This complex is a hygroscopic orange solid.

This article is about the oxidizing reagent. For the oxidation reaction, see Collins oxidation.
Collins reagent
Names
IUPAC name
Pyridine - trioxochromium (2:1)
Other names
Dipyridine chromium(VI) oxide
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/2C5H5N.Cr.3O/c2*1-2-4-6-5-3-1;;;;/h2*1-5H;;;;
    Key: NPRDHMWYZHSAHR-UHFFFAOYSA-N
  • InChI=1/2C5H5N.Cr.3O/c2*1-2-4-6-5-3-1;;;;/h2*1-5H;;;;/r2C5H5N.CrO3/c2*1-2-4-6-5-3-1;2-1(3)4/h2*1-5H;
    Key: NPRDHMWYZHSAHR-RGHLCDNPAM
SMILES
  • c1ccncc1.c1ccncc1.O=[Cr](=O)=O
Properties
C10H10CrN2O3
Molar mass 258.194
Appearance Red crystals
Density 1.565 g/cm3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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