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Topic: Biphenyl-4-ol C NMR signals  (Read 4116 times)

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Offline Christine1

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Biphenyl-4-ol C NMR signals
« on: October 17, 2011, 11:38:30 AM »
Why are 3 of the carbons in biphenyl-4-ol (C numbered 6 in the websites below) have the same C NMR chemical shifts? I cant see any symmetry that makes them equivalent. Are they just coincidence equivalence?

http://riodb01.ibase.aist.go.jp/sdbs/cgi-bin/direct_frame_top.cgi

Thank you so much.
Any references would be appreciated. :)
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Offline Honclbrif

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Re: Biphenyl-4-ol C NMR signals
« Reply #1 on: October 17, 2011, 01:12:37 PM »
Something to consider: what was the field strength of the instrument used to acquire this spectrum?
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Offline Christine1

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Re: Biphenyl-4-ol C NMR signals
« Reply #2 on: October 18, 2011, 12:25:05 AM »
It was 25.16 MHz in the spectrum but even 400MHz instrument gave the same result..
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