Guanidinium chlorochromate (GCC) has been first reported as a new oxidizing agent for the oxidation of a series of benzylic and a number of other aliphatic and aromatic alcohols to carbonyl compounds and quinones respectively in water in the presence of a phase-transfer catalyst and also in an organic solvent such as methylenechloride.

In the title compound, guanidinium chloridotrioxidochrom­ate(VI), (CH6N3)[CrClO3], both the cation and anion are generated by crystallographic mirror symmetry, with one O and one N atom and the Cr, Cl and C atoms lying on the mirror plane. The bond lengths in the guanidinium cation are inter­mediate between normal C—N and C=N bond lengths, indicating significant delocalization in this species. In the crystal structure, inter­molecular N—H⋯Cl inter­actions generate R 2 1(6) ring motifs. These ring motifs are further inter­connected by inter­molecular N—H⋯O hydrogen bonds into infinite chains along [010].

The new oxidizing reagent is suitable for secondary and benzylic‐type alcohols.

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