1H decoupled 13C nmr is standard & JCH data lost. 2D [1H13C] correlation recovers some data. It fails when 1H d's are close e.g. alkylbenzenes. Contradictory d's for C-2 of toluene are reported. 1H coupled 13C spectra [1DC] gave a firm answer [o>m>p]. Benzonitrile has two C's with no H. 1DC distinguishes these. 3-nitrobenzonitrile has conflicting d's in databases. 1DC settles d's and SDBS has corrected their assignments. Basis is that on a benzene ring 1JCH [~160 Hz]>>3JCH [~10 Hz] > 2JCH [~3 Hz] > 4JCH [~1 Hz]. Latter two are not resolved. Supported in part by an NSF grant for a 300 MHz spectrometer and by a Faculty Research grant from Fordham University.

Proton coupled <sup>13</sup>C nmr is useful for assigning chemical shifts in substituted benzenes

245th National Meeting (2013)

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Proton coupled 13C nmr is useful for assigning chemical shifts in substituted benzenes

Proton coupled ¹³C nmr is useful for assigning chemical shifts in substituted benzenes