First report of a permanent open form of a naphthopyran

• Author(s): Campos, Ana M. F. Oliveira ; Martins, Cristina I. ; Coelho, Paulo J. ; Carvalho, Luís H. Melo de
• Date: 2002
• Persistent ID: http://hdl.handle.net/1822/2257
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Photochromism; Naphthopyrans; Hydrogen-bond; Phenols
• Document Type: Article
• Language: English

Description

The synthesis of a permanent open form of a naphthopyran is described for the first time. The open form of the 10-hydroxy-2H-naphtho[1,2-b]pyran, obtained by reaction of 1,8-dihydroxy-naphthalene with 1,1-diphenylprop-2-yn-1-ol under acid catalysis, is stable due to the establishment of an intramolecular hydrogen bond.