(c)The cyclic acetal derived from isobutyl methyl ketone and ethylene glycol bears an isobutylgroup and a methyl group at C-2 of a 1,3-dioxolane ring.(d)Because the starting diol is 2,2-dimethyl-1,3-propanediol, the cyclic acetal is six-memberedand bears two methyl substituents at C-5 in addition to isobutyl and methyl groups at C-2.17.9The overall reaction isThe mechanism of acetal hydrolysis is the reverse of acetal formation. The frst four steps convertthe acetal to the hemiacetal.Step 1:Step 2:Step 3:1C6H5CHOCH2CH31HHOC6H5CHOCH2CH3OHH11OHCH2CH3C6H5CHOCH2CH31C6H5CHOCH2CH3O1HCH3CH211C6H5CHOHCH2CH3OCH2CH3OCH2CH3H1OHCH2CH3C6H5CHOCH2CH3O1HCH3
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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.