Draw the structures of the hemiacetals or hemiketals formed in these reactions:
b.

Question

Draw the structures of the hemiacetals or hemiketals formed in these reactions:

b.

Accepted Answer

All right, hire one. So this question is asking us to consider the reaction shown below in which we have one ketone reacting with one equivalent of an alcohol. What is the structure of the hemi AAU or Hemi Kau that will be produced? So let's go ahead and get started. Right. Recall first and foremost, that ketones can react with alcohols, one equivalent of an alcohol to be precise to produce a hemi gita. So by contrast, when an aldehyde reacts with one equivalent of an alcohol, the product is going to be a heavy aceta. So let's talk about what the product is going to look like. Recall that a ketone is a functional group where we have one car bal that's carbon double bonded to oxygen as well as two bonds, two carbon atoms on either side of that car bal. When this car bal here or this ketone to be more precise reacts with one equivalent of an alcohol, then the product is going to have a hydroxy and an oxy group attached to the same carbon. So essentially we take the car bono carbon here that carbon carbon is going to be connected to an O group or hydroxy group as well as an al coxie group or an or group. Specifically, the alcoy group is going to come from the alcohol that was added. Now, hemi acetyl are going to have a very similar structure except for the fact that aldehydes have at least one hydrogen atom attached to the carbonyl carbon. So you would see that in the structure of the hemi AOP. So let's go ahead and draw our product. Our starting ketone here is three ethyl cyclopentolate. So I'm going to start by drawing the r group of that ketone. So that's the cycle paned ring with an ethyl substituent. But instead of drawing that carbon carbon or rather that carbonel, right, I'm going to go ahead and draw two bonds between carbon and oxygen on that same position where the car bono used to be. So one of these oxygens is going to contain a hydrogen atom to create a hydroxy group and the other oxygen is going to be attached to the R group of the alcohol. And because our alcohol happens to be propane to all that's going to be an isopropyl group and there you have it. So with that in mind, here is our hemi kel product produced from the reaction between a ketone and an alcohol. So with that being said, thank you so very much for watching and I hope you found this helpful

Draw the structures of the hemiacetals or hemiketals formed in these reactions:
b.

Verified video answer for a similar problem:

Key Concepts

Hemiacetals and Hemiketals

Reaction Mechanism

Equilibrium in Organic Reactions