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

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  • $\begingroup$ Welcome to Chemistry.SE. Have a look at the tour to get familiar with this site. If necessary, mathematical expressions and equations can be formatted using $\LaTeX$. Please note that there is a homework policy here. $\endgroup$ – Klaus-Dieter Warzecha Feb 25 '15 at 19:28
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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.

enter image description here

image source

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  • $\begingroup$ Ok I believed Ar was for argon not Aromatic $\endgroup$ – k43823 Feb 25 '15 at 19:33
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    $\begingroup$ 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 '15 at 20:58

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