Experiment 4

EXPERIMENT 4: PREPARATION OF PHENYLBENZOATE In this experiment, you will lean pee system phenyl benzoate by the reaction of phenol with benzoyl chloride. Your aim in propaedeutic work of this sort must as concentrated a product as possible, in as steep give in as possible. [pic] CAUTION: BENZOYL CHLORIDE MUST BE KEPT IN THE FUME CUPBOARD AND NOT class 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- stoppleed feeding bottle of rough 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 divide on the hands or clothing. Its vapour is harmful and produces an super irritating effect on eyes.) Grease the stopper of the r eaction 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 date collect the material obtained by suction filtration using a Buchner filtration apparatus, preferably still in fume cupboard, for trace of benzoyl chloride blanchedthorn still persist. Break up any lumps on the penetrate paper with a glass rod, but be scrupulous 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 just now sufficient is use to rule o! ut the ester separating as an crude oil 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 forthwith with a Bunsen flame because it may catch fire. dry your sample in the oven. Calculate the per centum yield of your sample and assimilate 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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