The isomerization of unsubstituted azulene to naphthalene was the first reported thermal transformation of an aromatic hydrocarbon, and has consequently been the most widely studied rearrangement.
2.
(viii ) Provis, JL, Sarin, P, Gordon, M, Bell, JL, van Deventer, JSJ, Kriven, WM; 2006; Atomic Structure and thermal transformation of a cesium aluminosilicate geopolymer; A pair distribution function study; Dept of Chem.