Why do aldehydes undergo nucleophilic addition reactions while esters undergo nucleophilic acyl substitution reactions?
A: The carbonyl carbon of an ester is more electrophilic than that of an aldehyde.
B: Aldehydes are more sterically hindered than esters.
C: Once the nucleophile adds to an aldehyde, the tetrahedral intermediate is too sterically hindered to eliminate one of the attached groups.
D: Once the nucleophile adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic.
A: The carbonyl carbon of an ester is more electrophilic than that of an aldehyde.
B: Aldehydes are more sterically hindered than esters.
C: Once the nucleophile adds to an aldehyde, the tetrahedral intermediate is too sterically hindered to eliminate one of the attached groups.
D: Once the nucleophile adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic.
举一反三
- If the carbonyl group is at an end of the carbon chain (that is, in an aldehyde group), the monosaccharide is an aldose; if the carbonyl group is at any other position (in a ketone group), the monosaccharide is a _________.
- Fatal reactions to bee stings among adults __________ than once believed. A: more are probably common B: more common probably are C: are more probably common D: are probably more common
- Fatal reactions to bee stings among adults __________ than once believed.
- Once you do, there’s astrong chance you will enjoy it more than anything else.
- Letters， to some degree， are like a small piece of history that can be read more than once， savored and treasured.（ ）