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 preparingformaldehyde 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 thecorresponding 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.