[HoshiKagakushya]

Did I do this anywhere near correct?

[discodermolide]

My neck can't remain at 90° for long enough to work out your drawings. Please repost it and make it bigger because I am half blind as well.

[HoshiKagakushya]

Better Picture of my work

[discodermolide]

Question 4. The starting material has a chiral center in it so you get a mixture of diastereoisomers. The answer you gave is incorrect.

[rrr_asd]

[discodermolide]

I think I said that!

[rrr_asd]

Maybe, I'm wrong, but you claimed the opposite.

Question 4. The starting material has a chiral center in it so you get a mixture of diastereoisomers. The answer you gave is incorrect.

[discodermolide]

Maybe, I'm wrong, but you claimed the opposite.

Question 4. The starting material has a chiral center in it so you get a mixture of diastereoisomers. The answer you gave is incorrect.

The OP's question was number 4 in the question sheet asking" what is the relationship between the products".
In the case of the acetylide addition you already have a chiral centre, therefore as the addition creates another one this produces a mixture of diastereoisomers, which is the answer he required.

[rrr_asd]

I'm sorry, I didn't notice the question about relationship between the products.
I thought that you mean that all answer is incorrect.
I agree with you that there will be a mixture of diastereoisomers.

[HoshiKagakushya]

Thank you all so much.
Just to reiterate, the products of the ketone reaction are in fact enantiomers, but in the second reaction, the products are the two drawn rrr_asd and are diastereomers as stated by discodermolide.

The question also asks about optical activity. Would tit be accurate to state that the entantiomeric pair is a racemic mixture and no optical activity while the diastereomers do have optical activity?

Thanks you both so much for your wisdom. If you are familiar with kinetics, I have an unanswered question in the physical chem section :-)

[discodermolide]

"The question also asks about optical activity. Would tit be accurate to state that the entantiomeric pair is a racemic mixture and no optical activity while the diastereomers do have optical activity"
[/quote]



Yes that would be correct. But the optical activity ov the diastereoisomers only comes from that one optically active position.