Question

Draw the acetal obtanined from 1-propanol and benzaldehyde

Draw the ketal obtained from 2-propanol and 3-methylcyclpentanone

Can someone tell me where the actal/ketal comes from or do I just add it to the equation. Not sure how to start this. Thanks :)

Answer 1

Basically, they are telling you what is the ketone and what is acetal are. The addition of two 1-propanols to benzaldehyde will produce the acetal.The addition of one 1-propanol will produce an hemiacetal. The addition of two 2-propanols to methylcyclopentanone will produce the ketal.The addition of one 2-propanol will produce an hemiketall.

Aldehyde=acetal and ketone=ketal

Answer 2

Basically, they are telling you what the ketone is and what the ketal is, or what the aldehyde is and what the acetal is. The addition of two 1-propanols to benzaldehyde will produce the acetal. The addition of one 1-propanol to benzaldehyde will produce an hemiacetal. The addition of two 2-propanols to methylcyclopentanone will produce the ketal.The addition of one 2-propanol to methylcyclopentanone will produce an hemiketall.

Aldehyde=acetal and ketone=ketal

You have to draw the structure of the compounds, but the general rule is that the compounds will have a structure of OR-CH-OH or OR-CR-OH for hemiketals and hemiacetals, and they will have a structure of OR-CH(OR)-OH or OR-CR(OR)-OH for acetals and ketals.