What do they mean by activated aromatic ring?
Lancenigo di Villorba (TV), Italy You refer to XanthoProteic Test. XANTHOPROTEIC TEST As you know, dilute Nitric Acid’s aqueous solutions results able to get YELLOW COLORATION to human skin. This results possible since human skin contains several organic compounds, e.g. several proteins. Among these proteins there are someones able to undergo NITRATION REACTION G-H + HNO3 —> G-NO2 + H2O when the Nitro-Derivatives of the involved Proteins show YELLOW coloration. NITRATION Nitration is a common chemical reaction interesting several Aromatic Stuffs. In an hot aqueous solutions of Nitric Acid, you dissolve the Aromatic Compounds which need for several minutes or some hours (e.g. usually, these aren’t FAST reactions). Scientists refer to Nitration as ELECTROPHILIC AROMATIC SUBSTITUTION Reactions, e.g. chemical reactions able to substitute Hydrogen atoms of an Aromatic Stuff. Electrophilic Aromatic Substitutions involve a Chemical Intermediate, the ELECTROPHILIC AGENT as NO2+ Nitronium Ion
