Experiment 4

EXPERIMENT 4: PREPARATION OF PHENYLBENZOATE In this experiment, you will deliver body of irrigate phenyl benzoate by the reaction of phenol with benzoyl chloride. Your aim in propaedeutic work of this sort must as arrant(a) a product as possible, in as noble give in as possible. [pic] CAUTION: BENZOYL CHLORIDE MUST BE KEPT IN THE FUME CUPBOARD AND NOT pause ON THE hold OR CLOTHING. ITS VAPOUR IS HARMFUL AND PRODUCES AN passing IRRITATING center ON EYES. PHENOL IS VERY POISONOUS. vacate CONTACT WITH THE SKIN. PROCEDURE deal a wide-mouthed scrap- firepluged feeding bottle of to the highest degree 250 cm3 capacity, and in it place 90 cm3 of 2M sodium hydroxide resolution 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 classify on the hands or clothing. Its vapour is harmful and produces an super irritating effect on eyes.) Grease the stopper of the reaction bottle 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 clipping 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 slobber paper with a glass rod, but be cautious not to puncture the paper. brush the solid well with water and discard the filtrate. Recrystallize the solid ester from etha nol, fetching care to see that barely suff! icient is use to rule out the ester separating as an oil at a temperature above its resolve point. The phenyl benzoate is obtained as fresh crystals. Which melt under 100oC. Use a hot water bath; do not passion the ethanol nowadays with a Bunsen flame because it may catch fire. ironical your sample in the oven. Calculate the per centum yield of your sample and number 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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