Proton NMR

[MLT2MT2DO]

Is there normally such thing as a "reference peak" located at "0" in proton NMR? I never learned such a thing in Ochem.

Looking over a GS test, I interpretted the peak to be ~0.2 and labeled it a terminal alkane. The explanation says their is only a single peak though and the peak at "0" is a reference peak.

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[venacontracta]

Yes, there is a reference compound used in 1H NMR... it is tetramethylsilane (TMS), and the chemical shift of TMS is defined to be 0.0 ppm. It is a highly shielded compound so almost everything absorbs downfield of it.

 

[MLT2MT2DO]

Yes, there is a reference compound used in 1H NMR... it is tetramethylsilane (TMS), and the chemical shift of TMS is defined to be 0.0 ppm. It is a highly shielded compound so almost everything absorbs downfield of it.

Great thanks, this is something my UG class never addressed.

Also when doing NMR in lab I had never seen this reference compound, so this was totally foreign to me.