Gibbs Reagent

Title: Gibbs Reagent
CAS Registry Number: 101-38-2
CAS Name: 2,6-Dichloro-4-(chloroimino)-2,5-cyclohexadien-1-one
Additional Names: 2,6-dichloro-p-benzoquinone-4-chloroimine; N,2,6-trichloro-p-quinoneimine; 2,6-dichloroquinone chloroimide; N,2,6-trichloroquinoneimine; N,2,6-trichlorobenzoquinone imine
Molecular Formula: C6H2Cl3NO
Molecular Weight: 210.45
Percent Composition: C 34.24%, H 0.96%, Cl 50.54%, N 6.66%, O 7.60%
Literature References: Reagent used to determine the presence of phenols. The reaction with phenols unsubstituted in the para position is called the Gibbs Reaction: H. D. Gibbs, Chem. Rev. 3, 291 (1927). Prepn of the reagent: idem, J. Biol. Chem. 72, 649 (1927); G. I. Mikhailov, Trans. Inst. Pure Chem. Reagents 16, 83 (1939). Analysis of the Gibbs color reaction: J. C. Dacre, Anal. Chem. 43, 589 (1971).
Properties: Yellow needles from alcohol, mp 65-67°.
Melting point: mp 65-67°
Use: In determination of phenols.
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