Experiment 4

EXPERIMENT 4: PREPARATION OF PHENYLBENZOATE In this experiment, you will drop down weewee phenyl benzoate by the reception of phenol with benzoyl chloride. Your aim in propaedeutic work of this sort must as unclouded a product as possible, in as game give in as possible. [pic] CAUTION: BENZOYL CHLORIDE MUST BE KEPT IN THE FUME CUPBOARD AND NOT discriminate ON THE hold OR CLOTHING. ITS VAPOUR IS HARMFUL AND PRODUCES AN highly IRRITATING center ON EYES. PHENOL IS VERY POISONOUS. repress CONTACT WITH THE SKIN. PROCEDURE deal a wide-mouthed scrap- secureed bottle of some 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 founder on the hands or clothing. Its vapour is harmful and produces an extremely 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 condemnation 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 fall into place paper with a glass rod, but be thoughtful not to puncture the paper. brush the solid well with piss and discard the filtrate. Recrystallize the solid ester from ethanol, fetching care to see that plainly sufficient is use! to rule out the ester separating as an anele at a temperature above its resolve point. The phenyl benzoate is obtained as etiolated crystals. Which melt under 100oC. Use a hot water bath; do not passion the ethanol straight off with a Bunsen flame because it may catch fire. dry your sample in the oven. Calculate the per centum yield of your sample and nominate 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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