Organic 2 Review Problem 409

Organic 2 Review Problem 409 - REACTIONS AND I...

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REACTIONS AND IDENTIFICATION 393 Benzyl chloride. i. Oxidation to benzole add. Boil a mixture of i ml. of benzyl chloride, 50 ml. of saturated aqueous KMnO 4 solution and 2 g. of anhydrous Na 2 CO 3 under reflux for 30 minutes. Acidify with cone. HCl and then add 25% Na 2 SO 3 solution until the brown precipitate of MnO 2 has dissolved. On cooling, benzoic acid crystallises out. Filter through a small Buchner funnel, wash with water and identify (p. 347). When recrystallised from water, benzoic acid has m.p. 121°. Section 26. Hydrocarbons. C x Hy. (cf. Table XXVII, p. 560) Benzene, toluene, naphthalene, anthracene, phenanthrene, biphenyl, petroleum. Physical Properties. Benzene, C 6 H 6 , toluene, C 6 H 5 -CH 3 , and petrol (a mixture of aliphatic hydrocarbons, e.g., pentane, hexane, etc.) are colourless liquids, insoluble in and lighter than water. Benzene and toluene, which have similar odours, are not readily distinguishable chemically, and their physical constants should therefore be carefully
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