lqmorris Posted June 6, 2018 Share Posted June 6, 2018 Why are the two molecules identical? Every time I assign priority to the stereocenters I end up getting RS for the first one and SR for the second one. Where am I going wrong? Link to comment Share on other sites More sharing options...
studiot Posted June 6, 2018 Share Posted June 6, 2018 You seem to have several versions of the molecule in different pics! So far as I can tell it is a six carbon main chain with two methyl side groups emanating from C3 and C4. In that case the molecule is symmetrical about the C3-C4 bond. Here is a pic of a model of what I mean. The main chain is shown in grey and the side methyls are blue and red. Link to comment Share on other sites More sharing options...
lqmorris Posted June 7, 2018 Author Share Posted June 7, 2018 Sorry I should've labeled the pictures better, the first pic was the original problem the rest was the work I'd done. I got it now though, thanks! Link to comment Share on other sites More sharing options...
adianadiadi Posted June 7, 2018 Share Posted June 7, 2018 Both are same. 2nd one is another way of writing the same molecule. Hint: when you exchange to bonds with each other, the configuration is inverted i.e. from R to S or S to R. Link to comment Share on other sites More sharing options...
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