Dolbier HW Solutions 359

Dolbier HW Solutions 359 - 453 ALDEHYDES AND KETONES:...

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Reaction of acetaldehyde with 1,2-ethanediol yields the cyclic acetal. ( c ) The target molecule is, in this case, the cyclic acetal of 1,2-ethanediol and formaldehyde. The preparation of 1,2-ethanediol was described in part ( b ). One method of preparing formaldehyde is by ozonolysis of ethylene. Another method is periodate cleavage of 1,2-ethanediol. Cyclic acetal formation is then carried out in the usual way. ( d ) Acetylenic alcohols are best prepared from carbonyl compounds and acetylide anions. Acetaldehyde is available as in part ( a ). Alkynes such as acetylene are available from the corresponding alkene by bromination followed by double dehydrobromination. Using ethyl-
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This note was uploaded on 09/28/2011 for the course CHM 2210 taught by Professor Reynolds during the Fall '01 term at University of Florida.

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