EDIT: I think I was tired when I asked this the first time. I guess my question

Question

EDIT: I think I was tired when I asked this the first time. I guess my question is--although there are stereocenters, would the molecule have a line of symmetry between C3 and C4 and still be achiral despite having two R stereocenters?
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ORIGINAL QUESTION HERE:

Does this molecule have R stereocenters or is it a meso compound?
My book has this problem and the solution says that there is an R stereocenter on each of the C's where the OH are connected. The diagram shows solid wedges connecting both alcohol groups. I thought this would be an example of a meso compound, but have a feeling I'm missing something. Thanks.

EDIT: I think I was tired when I asked this the first time. I guess my question is--although there are stereocenters, would the molecule have a line of symmetry between C3 and C4 and still be achiral despite having two R stereocenters? ORIGINAL QUESTION HERE: Does this molecule have R stereocenters or is it a meso compound? My book has this problem and the solution says that there is an R stereocenter on each of the C's where the OH are connected. The diagram shows solid wedges connecting both alcohol groups. I thought this would be an example of a meso compound, but have a feeling I'm missing something. Thanks.

Explanation / Answer

In a molecule, if the centres are of opposite (r and S or vice versa), it will cancell the optical rotation of each other with net rotation zero. But if both the center are R, it will not be a meso.

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