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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: haiph12 on April 02, 2004, 06:52:32 AM

Title: A racemic problem
Post by: haiph12 on April 02, 2004, 06:52:32 AM

can you help me to solve



Edit: edited title for better indexing. Mitch

Title: Re:can you help to solve the problem
Post by: AWK on April 03, 2004, 06:52:31 AM

Which is 30.1?

Title: Re:can you help to solve the problem
Post by: haiph12 on April 03, 2004, 09:06:47 AM

30.1
It is 1

Title: Re:can you help to solve the problem
Post by: haiph12 on April 03, 2004, 09:12:33 AM

The problem in  
36the preparatory international olympiad chemistry
Problem 30.
http://www.icho.de/prepprobs/IChO_Ger_PrepProbs_25-30.pdf

help me to solve please?
Thank

Title: Re:can you help to solve the problem
Post by: GCT on April 04, 2004, 04:04:14 PM

Four enatiomeric products can be formed, two pairs of mirror image enantiomers, and these two pairs will be diastereoisomers of each other.  The reason for this selectivity of diastereo is that the transition states are different...the rate is different...and the products have different properties since they are not mirror image compounds.

For this problem you need to know the mechanism of the reaction...that's pretty much all there is to it.

Once you do you can know the enatiomeric pair B (picked due to diastereoselectivity) which is a diastereo of B*, the enantiomeric pair which is not formed.

Title: Re:can you help to solve the problem
Post by: AWK on April 05, 2004, 09:56:20 AM

Enclosed please find a scheme

Title: Re:can you help to solve the problem
Post by: haiph12 on April 06, 2004, 08:03:48 AM

Thank You