EK 30' orgo

[patrickmbyrne]

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I posted a picture of the question. I am having trouble with question three. The answer is "they must be stereoisomers because they have the same bond to bond connectivity (no problem). They can be separated by physical means(crystallization) so they must be diastereomers!? Notice from the diagram they are not mirror images of each other and thus cannot be enantiomers.

My logic -> 1 stereocenter = R,S or S,R so they must be enantiomers? I mean I see that Ph group hanging out there, but I know it isn't chiral so. They must be enantiomers.

Can someone please explain where I am going wrong? Am I going wrong?

Thanks,
Patrick

 

[DrknoSDN]

Question 3 is asking about the "salts" created in reaction 1. That the COO- and +NH3 salt.
Both salts are not enantiomers because both versions of the amine are "R" while the alkyl halides are R and S.

The salts are RR and SR. Diastereomers.

 

[patrickmbyrne]

You are 100% right. Thank you so much.