Structural elucidation of the red dye obtained from reaction of 1,8-naphthalene...

• Author(s): Campos, Ana M. F. Oliveira ; Carvalho, Luís H. Melo de ; Silva, Artur M. S. ; Martins, Cristina I. ; Coelho, Paulo J.
• Date: 2003
• Persistent ID: http://hdl.handle.net/1822/2256
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Naphthopyrans; 1,8-naphthalenediol; Dye; Hydrogen-bond
• Document Type: Article
• Language: English

Description

The structure of the intensely coloured red product obtained through the reaction of 1,8-naphthalenediol with 1,1-diphenylprop-2-yn-1-ol was reinvestigated. Instead of the expected permanent open form of the naphthopyran, the dye presents the alpha,beta-unsaturated chain at a different position of the naphthalene nucleus. The structure of this compound was elucidated on the basis of detailed spectral analysis, including 2D NMR experiments.