Simple aminoacetals hydrolyze quickly and easily in dilute acid. Propose a mechanism for hydrolysis of the following aminoacetal:

Hydration of an aldehyde is also catalyzed by hydroxide ion. Propose a mechanism for the reaction.

Which of the following are a. hemiacetals? b. acetals? c. hydrates?

1.

Which of the following are a. hemiacetals? b. acetals? c. hydrates?

3.

In Section 17.7.4, we studied the acid-catalyzed hydrolysis of acetals. The acetal shown here resists hydrolysis by the mechanism in Figure 17.63. Why? [Draw the intermediates as if the reaction would occur, then analyze the intermediates for any problems.]

Which of the following compounds is classified as an acetal?

Which of the following correctly describes the synthesis of an acetal from an aldehyde ($\mathrm{acetal} a$) and a ketone ($\mathrm{acetal} b$)?

Which of the following sets of compounds are formed as the major organic products when an acetal is hydrolyzed in aqueous $H_{2}O$ and $\mathrm{HCl}$?