A Colorful Grignard Reaction:: Preparation of the Triarylmethane Dyes from 4-Bromo-N,N-Dimethylaniline

• Douglass F. Taber ^[1] ; Robert P. Meagley ^[1] ; Danielle Supplee ^[1]
  1. [1] University of Delaware

     University of Delaware

     Estados Unidos

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 73, Nº 3 (March), 1996, págs. 259-260
• Idioma: inglés
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• Resumen

  • The Grignard reagent is readily prepared from 4-bromo-N,N-dimethylaniline. Addition of this Grignard reagent to diethyl carbonate, followed by acid hydrolysis gives the triarylmethane dye Crystal Violet. Addition of the Grignard reagent to methyl benzoate, followed by acid hydrolysis gives the dye Malachite Green. A procedure suitable for an undergraduate laboratory course is presented.