On dulcin detection by halochromism
Department of Organic Chemistry, Faculty of Chemistry, National Autonomous University of Mexico, Mexico City (CDMX), Mexico.
Review
International Journal of Scholarly Research in Chemistry and Pharmacy, 2024, 04(01), 001–004.
Article DOI: 10.56781/ijsrcp.2024.4.1.0023
Publication history:
Received on 01 May 2024; revised on 03 June 2024; accepted on 06 June 2024
Abstract:
Dulcin has been detected by reaction with fuming nitric acid followed by interaction with phenol and sulphuric acid. Other tests use electron capturing reagents such as mercuric nitrate or silver nitrate. The test under study is not based in degradations initiated by nitration, nor by oxidations by electron removal, but by molecular fission after prototropy enhanced by heating. p-Phenetidine is obtained and forms the ammonium salt with sulphuric acid. After cooling and water addition, the solution is carefully covered with ammonium or sodium hydroxide. The interphase is coloured blue or violet-blue due to formation of the halochromic salt p-ethoxyphenylammonium phenoxide, from phenol and after ion switching.
Keywords:
Halochromic salt; Ion switching; Morpurgo test; p-Phenethol carbamide; Phenol; Sulphuric acid
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