Organic 2 Review Problem 424

Organic 2 Review Problem 424 - 408 PRACTICAL ORGANIC...

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Unformatted text preview: 408 PRACTICAL ORGANIC CHEMISTRY (/) Blackening with effervescence. Carbohydrates; tartrates and lactates. (g) Blackening without effervescence. Certain polyhydric phenols. Succinates (strong heating). (h) Gelatinous polymeric product. Benzyl alcohol. Note. A large variety of organic compounds darken to some extent (without actual blackening) when heated with cone. H 8 SO 4 . H. Treat with dil. H Cl, then w arm . Substance insoluble in cold water ^ readily soluble in warm dil. H C l. Various basic substances, such as aromatic amines (naphthyl- amines dissolve with difficulty in dii. HCl, diphenylamine only in cone. HCl, triphenylamine insoluble); nitro-anilines; some amino- carboxylic acids. I. (a) Heat with Fehling's solution. Disappearance of the deep blue colour and precipitation of cuprous oxide indicates reducing agents such as: Aldehydes (including chloral hydrate); formates and lactates; some esters; chloroform and iodoform; reducing sugars; some phenols....
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

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