Publication
Indigo revisited
| Summary: | The synthesis of indigo and five derivatives containing electron-donating groups (methyl or methoxyl) by known methods, is described. The Baeyer-Drewsen method was followed in most cases. Another product containing ester groups was prepared via the corresponding 3-formylindole by a Dakin reaction. The blue dyes were characterized by their absorption (UV-Vis and IR) and NMR spectra, and elemental analysis or mass spectrometry. The objective of this study was to prepare and fully characterize indigo derivatives with electron-donating groups and to obtain and characterize a carboxylated indigo derivative. |
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| Main Authors: | Travasso, Maria Irene G. M. G. |
| Other Authors: | Santos, Paula C. S.; Campos, Ana M. F. Oliveira; Raposo, M. Manuela M.; Prasitpan, N. |
| Subject: | Dyes, Dimethylindigo Tetramethoxyindigo Baeyer-Drewsen method |
| Year: | 2003 |
| Country: | Portugal |
| Document type: | article |
| Access type: | open access |
| Associated institution: | Universidade do Minho |
| Language: | English |
| Origin: | RepositóriUM - Universidade do Minho |
| Summary: | The synthesis of indigo and five derivatives containing electron-donating groups (methyl or methoxyl) by known methods, is described. The Baeyer-Drewsen method was followed in most cases. Another product containing ester groups was prepared via the corresponding 3-formylindole by a Dakin reaction. The blue dyes were characterized by their absorption (UV-Vis and IR) and NMR spectra, and elemental analysis or mass spectrometry. The objective of this study was to prepare and fully characterize indigo derivatives with electron-donating groups and to obtain and characterize a carboxylated indigo derivative. |
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