New Help Finding the Structure from NMR/IR SpectrasWatch
My tutorial have been set this http://www.stolaf.edu/depts/chemistr...d/index.htm?15 NMR/IR interpretation question and we've no idea what to do, we know what the structure is but no idea how to justify the position of the carboxylic acid. Can someone help us out?
What makes you think you have a COOH group? I don't think you have one. The H-NMR tells you about the substituiton pattern on the ring(s) - for example you can see that one of the rings is symmetrical since you have 2 roofing peaks with integration 2.
We then used some software to generate the predicted NMRs of both molecules but they were too inaccurate to tell us which was which for sure.
This was the structure that our lab demonstrator gave us: http://i.imgur.com/f0e60JE.jpg
However, either way, i'm not sure how to justify the position of the -OH group from the NMRs... The IRs don't tell me much either...
Consider a disubstituted benzene ring and how the proton signals change when you have them 1,2 1,3 and 1,4 substituted. Draw something simple on chemdraw and use it's predictor if you're still struggling.