Organic 2 Review Problem 305

Organic 2 Review Problem 305 - P REPARATIONS 289[NOTE...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
PREPARATIONS 289 [NOTE. Hydrocarbons such as ethyl-benzene can also be prepared by the Clemmensen reduction of the corresponding ketone. This is exemplified by the reduction of />-methylacetophenone (p. 290)]. Required: Sodium, 22-5 g.; dry ether, ioo ml.; bromoben- zene, 34 ml.; ethyl bromide, 31 ml. Using the sodium press described on p. 82, press 22-5 g. of sodium into wire, and allow the latter to fall directly into ioo ml. of anhydrous ether (preparation, p. 82) contained in a 750 ml. round-bottomed flask. Fit the latter with an efficient (preferably double-surface) reflux water-condenser, and stand the flask on a cork ring. Now pour down the condenser a mixture of 34 ml. (50 g.) of dry bromobenzene and 31 ml. (45-5 g., i.e., a 30% excess) of ethyl bromide. Close the top of the condenser with a calcium chloride tube and shake the mixture thoroughly. After 10-15 minutes, the reaction will cause the ether to boil steadily. Shake the mixture occasionally during the next two hours in order to prevent the wire from becoming coated
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online