Organic 2 Review Problem 98

Organic 2 Review Problem 98 - 8 2 PRACTICAL ORGANIC...

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Unformatted text preview: 8 2 PRACTICAL ORGANIC CHEMISTRY ether, particularly when it is being distilled. The liquid itself is very readily inflammable, and in addition the vapour forms with air a heavy and highly explosive mixture, which may roll along the laboratory bench for surprising distances, and still be capable of exploding when it comes in contact with a flame, the explosion at once travelling back towards the origin of the vapour. For Williamson's Method for the preparation of ethers, see p. 103. Pure E ther. Pure ether (entirely free in particular from water) is frequently required in the laboratory, and especially for the preparation and use of Grignard reagents. It is best prepared in quantity for classes by adding an ample quantity of granular calcium chloride to a "Winchester" bottle of technical ether, and allowing the mixture to stand for at least 24 hours, preferably with occasional shaking. The greater part of the water and ethanol present in the ether is thus removed. The ether should now be filtered through a large fluted...
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