Determining Stereocenter Configuration from Newman Projections

[ieatshrimp24]

---

Members don't see this ad.

http://imgur.com/HGlYYHz

Above are two Newman projections for tartaric acid. How can I determine the stereocenter configuration from these two pictures? I'm thinking of changing the projections to line angle drawings but I don't know which substituents belong on a wedge or dash. Any help?

 

[ieatshrimp24]

http://imgur.com/SsYWxiR

Sorry for the first post. This is the link for Newman projections.

 

[ClemsonFirst]

What you can do is act like the two bottom lines are in the plane of the page (the OH and the H). The top COOH is then your wedge and the R group on the back is your dashed wedge. If the side group goes into the paper, like the R groups both do, then they will be on a dash. I generally place the top group on a wedge.

 

[ieatshrimp24]

What about this method? The groups on the left side of the Newman projections are on wedges and the groups on the right side are on dashes. Then verticle lines are just on sticks. I found that this works when determining whether the chiral centers are R or S.

 

[ClemsonFirst]

Yeah. Works exactly the same since the images are supposed to be 3D and rotate. If you get yourself a ball and stick model kit, you should be able to visualize it much better.

 

[ieatshrimp24]

Thanks for your help!!!