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How to Calculate NMR Signals

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w451208:
How do you calculate the Number of NMR singles you will get. I was under the assumption that similar proton environments will count as one but this is not true for number 12. Why is that?

saden99:
What did you think the answer was for #12 and I could explain from there...

However, to answer the question--that has what I assume is an ether (I'm not sure why it's drawn that way but...meh). The ether is going to effect the shielding of the protons depending on their proximity to the oxygen.

w451208:
I thought the answer would be 5 for number 12. This is because I counted the ch2 bonds on the right as one.

saden99:
I assume I'm looking at the ones you described and those would fit into the explanation. One of the groups is farther than the other and would be more downfield on the NMR.

w451208:


Like this one. Why is it five when I counted 4?



Also why is this 4?

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