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

• Autor(es): Campos, Ana M. F. Oliveira ; Carvalho, Luís H. Melo de ; Silva, Artur M. S. ; Martins, Cristina I. ; Coelho, Paulo J.
• Data: 2003
• Identificador Persistente: http://hdl.handle.net/1822/2256
• Origem: RepositóriUM - Universidade do Minho
• Assunto(s): Naphthopyrans; 1,8-naphthalenediol; Dye; Hydrogen-bond
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

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.