The data sheet does not have any chemical shifts in this range for compounds containing only carbon and hydrogen

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1 Answer 1


Protons attached to a carbon that is connected to a benzene ring typically resonate in the range 2.2-2.9 ppm (see the Ar-CH range in this table).

Here is the proton nmr spectrum for ethylbenzene. The methylene protons absorb around 2.7 ppm, right in the upper end of the expected range.

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image source

  • $\begingroup$ Ok I believed Ar was for argon not Aromatic $\endgroup$
    – k43823
    Feb 25, 2015 at 19:33
  • 2
    $\begingroup$ Organic chemists use a number of abbreviations that look like element symbols. For example, $\ce{Ar}$ is aryl and $\ce{Ac}$ is acetyl, even though those symbols also stand for argon and actinium. We feel like we can get away with this because there are currently no known compounds with carbon-argon and carbon-actinium bonds. $\endgroup$
    – Ben Norris
    Feb 25, 2015 at 20:58

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