1,1-Diphenyl-2-picrylhydrazyl (Free Radical)
Title: 1,1-Diphenyl-2-picrylhydrazyl (Free Radical)
CAS Registry Number: 1898-66-4
CAS Name: 2,2-Diphenyl-1-(2,4,6-trinitrophenyl)hydrazyl
Additional Names: DPPH
Literature References: Prepn: Goldschmidt, Renn, Ber. 55B, 628 (1922); Lyons, Watson, J. Polym. Sci. 18, 141 (1955); Arbuzov, Valitova, Zh. Obshch. Khim. 27, 2354 (1957). Structure: Poirier et al., J. Org. Chem. 17, 1437 (1952).
Properties: Large, dark violet prisms from benzene + petr ether, mp 127-129° (dec). mp also reported as 132-133°.
Melting point: mp 127-129° (dec); mp also reported as 132-133°
Use: Analytical reagent for reducing substances: Schenck et al., Tetrahedron Lett. 1967, 193.

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