Wallach Rearrangement

O. Wallach, L. Belli, Ber. 13, 525 (1880).

Acid-catalyzed rearrangement of azoxybenzenes to p-hydroxyazobenzenes:

Reviews: K. H. Schündehütte, Houben-Weyl 10/3, 771-773 (1965); E. Buncel in Mechanisms of Molecular Migrations vol. 1, B. S. Thyagarajan, Ed. (Interscience, New York, 1968) p 61; R. A. Cox, E. Buncel in The Chemistry of Hydrazo, Azo and Azoxy Groups pt. 2, S. Patai, Ed. (Wiley, New York, 1975) pp 808-837; J. Yamamoto et al., Tetrahedron 36, 3177 (1980).