Draw a mechanism for the hydrolysis of the acetal given below in the presence of an acid.

Draw the product of the reaction shown below:

The reaction below is unsuccessful in producing the desired alcohol.

How may the reaction conditions be changed to allow the desired alcohol product to form?

Propose the synthesis of the following compound using the given starting material. Please note that the reaction needs a protecting group.

Acetals can be used as protecting groups for aldehydes, ketones, and diols. The acetal formed with acetone and diol is termed acetonide. Draw the structure of acetonide formed by the acid-catalyzed reaction of acetone with the following diol.

Acetals are used as protecting groups for 1,2-diols and carbonyl compounds (aldehydes and ketones). Formation of an acetal using a diol as an alcohol yields a cyclic acetal. Provide the cyclic acetal formed when the following compound reacts with cyclobutane-1,2-diol under acid catalysis.

Draw the product(s) of the reaction shown below, considering stereochemistry.

Propose a suitable mechanism to show the imine formation in the given reaction.