Organic 2 Review Problem 391

Organic 2 Review Problem 391 - R EACTIONS A ND I...

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REACTIONS AND IDENTIFICATION 375 (b) aqueous or ethanolic solutions of the amine salt and of sodium picrate (saturated). (, pp. 550-551.) (B) Acetyl Derivatives. Proceed as in (2) above. Use only for aromatic amines, since acetyl derivatives of aliphatic amines are usually soluble in cold water. (, pp. 550-551.) (C) Benzoyl and Toluene-p-sulphonyl Derivatives. Proceed as in (3) above, using benzoyl or toluene- p -sulphonyl chlorides: benzene-sul- phonyl chloride can be similarly used (see 3 above). (, pp. 550-551.) (D) Phenylurea Derivatives. This reaction usually proceeds readily when cold solutions of the dried amine and of phenyl isocyanate, each in petroleum (b.p. 100-120°), are mixed; if no reaction is obvious, heat under reflux for 30 minutes. (Care in using the isocyanate, p. 336.) R-NH 2 -f C 6 H 5 NCO = RNH-CO-NHC 6 H 6 Traces of water will contaminate the product with diphenylurea (p. 336) if the solution is boiled: hence the need for anhydrous conditions. i-Naphthylisocyanate reacts more slowly with water, and the i -naphthyl-
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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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