October 09, 2024, 10:05:33 AM
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Topic: C-13 shift corrections for vinyl substituents  (Read 1687 times)

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Offline Babcock_Hall

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C-13 shift corrections for vinyl substituents
« on: June 13, 2024, 09:57:02 AM »
https://organicchemistrydata.org/hansreich/resources/nmr/?index=nmr_index%2F13C_shift#cdata19
When I went to the Hans Reich legacy collection and looked at a table of mono-substituted alkenes, I noticed that they used 123.3 as the base value.  I did not see methyl sulfone.  I looked up methyl vinyl sulfone, and eyeballing a Wiley spectrum, I would put the two carbons at 137.5 and 129.4 ppm, respectively.  Is this enough to establish shift corrections of +6.1, and +14.2, respectively, or do such corrections always use an average of several compounds?  I am guessing that the values in this table are based upon whatever data were available at the time, which might mean that just one compound was used.

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