Color reactions of aldehydes and ketones with vanillin in alkaline medium |
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| Affiliation: | 1. Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA 02215-2521, USA;2. Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM 87131, USA;1. The Procter & Gamble Company, 1853 Strombeek-Bever, Belgium;2. The Procter & Gamble Company, Cincinnati, OH 45253, USA;1. Cardiff School of Engineering, Cardiff University, Queen’s Buildings, The Parade, Cardiff CF24 3AA, United Kingdom;2. Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, United Kingdom;3. Tata steel UK, Port Talbot SA13 2NG, United Kingdom;1. Institut Respiratori, Hospital Clínic, Universitat de Barcelona, Spain;2. Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain;3. CIBER Enfermedades Respiratorias (CIBERES), Spain;4. ARGUS Detection Dogs, Barcelona, Spain;5. Institut Clínic de Malalties Hematològiques i Oncològiques, Hospital Clínic, Universitat de Barcelona, Spain;6. Hospital Universitari Sagrat Cor, Barcelona, Spain;1. Department of Geography, The University of Georgia, 204 Geography-Geology Building, Athens, GA 30602, USA;2. Department of Anthropology, The University of Georgia, Baldwin Hall, Athens, GA 30602, USA |
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| Abstract: | Vanillin in alkaline medium is a very useful reagent for the detection of carbonyl-bearing compounds, especially ketones, yielding yellow, orange or red colorations in the reaction mixture. he intensity of the reaction and the particular color produced depends upon the constitution of the compound and its concentration. The reaction works best with aliphatic ketones, especially when these contain a methyl group. Acetone with two methyl radicals yields the maximal color. As the carbon chains in the ketone radicals lengthen, reactivity diminishes. Aromatic ketones are least reactive or do not react at all. |
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