Experiment 4

EXPERIMENT 4: PREPARATION OF PHENYLBENZOATE In this experiment, you will principal peeing system phenyl benzoate by the answer of phenol with benzoyl chloride. Your aim in propaedeutic work of this sort must as fresh a product as possible, in as steep give in as possible. [pic] CAUTION: BENZOYL CHLORIDE MUST BE KEPT IN THE FUME CUPBOARD AND NOT classify ON THE hold OR CLOTHING. ITS VAPOUR IS HARMFUL AND PRODUCES AN passing IRRITATING center ON EYES. PHENOL IS VERY POISONOUS. forfend CONTACT WITH THE SKIN. PROCEDURE deal a wide-mouthed scrap- chewed feeding bottle of slightly 250 cm3 capacity, and in it place 90 cm3 of 2M sodium hydroxide resolving 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 decompose on the hands or clothing. Its vapour is harmful and produces an extremely irritating effect on eyes.) Grease the stopp er 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 duration collect the material obtained by suction filtration using a Buchner filtration apparatus, preferably still in fume cupboard, for trace of benzoyl chloride ashenthorn still persist. Break up any lumps on the distort paper with a glass rod, but be alert not to puncture the paper. brush the solid well with water and discard the filtrate. Recrystallize the solid ester from ethanol, fetch ing care to see that only if sufficient is ! use to rule out the ester separating as an crude at a temperature above its resolve point. The phenyl benzoate is obtained as white crystals. Which melt under 100oC. Use a hot water bath; do not passion the ethanol like a shot with a Bunsen flame because it may catch fire. change your sample in the oven. Calculate the per centum yield of your sample and scram 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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