Experiment 4

EXPERIMENT 4: PREPARATION OF PHENYLBENZOATE In this experiment, you will happen piss phenyl benzoate by the answer of phenol with benzoyl chloride. Your aim in propaedeutic work of this sort must as unclouded a product as possible, in as soaring give in as possible. [pic] CAUTION: BENZOYL CHLORIDE MUST BE KEPT IN THE FUME CUPBOARD AND NOT scatter ON THE hold OR CLOTHING. ITS VAPOUR IS HARMFUL AND PRODUCES AN passing IRRITATING center ON EYES. PHENOL IS VERY POISONOUS. avert CONTACT WITH THE SKIN. PROCEDURE deal a wide-mouthed scrap- naged feeding bottle of or so 250 cm3 capacity, and in it place 90 cm3 of 2M sodium hydroxide event and 5g of phenol. Go to a grass cupboard and pour into the bottle with care 9 cm3 of benzoyl chloride. (Caution: This fluent must must be kept in the reek cupboard and not crack on the hands or clothing. Its vapour is harmful and produces an extremely irritating effect on eyes.) Grease the stopper of the reaction b ottle lightly with Vaseline and exchange it in the bottle, then, holding the stopper in place securely, crusade the bottle vigorously at intervals for a period of 15 minutes.

At the end of this clip collect the material obtained by suction filtration using a Buchner filtration apparatus, preferably still in fume cupboard, for trace of benzoyl chloride may still persist. Break up any lumps on the try paper with a glass rod, but be blow-by-blow not to puncture the paper. brush the solid well with water and discard the filtrate. Recrystallize the solid ester from ethanol, fetching care to see that still su fficient is use to rule out the ester separ! ating as an fossil oil at a temperature above its resolve point. The phenyl benzoate is obtained as uncontaminating crystals. Which melt under 100oC. Use a hot water bath; do not passion the ethanol direct with a Bunsen flame because it may catch fire. dry out your sample in the oven. Calculate the per centum yield of your sample and pull away the melting point. The temperature at which the crystals start-off melt...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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