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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: goldy on October 12, 2010, 03:10:11 AM

Title: Gamma effect
Post by: goldy on October 12, 2010, 03:10:11 AM

Hello everybody,
I a question regarding to the gamma effect that why the gamma carbon in an hexanol tends to be upfield in NMR spectrum than other carbon atoms?
The effect is called gamma effect but why does this occur?
CH3-CH2-CH2-CH2-CH2-CH2-OH


If anybody knows the explanation for this then please reply as soon as possible.

Thank you so much

Title: Re: Gamma effect
Post by: Cesium-137 on October 17, 2010, 09:32:58 PM

The carbons closest to the oxygen are deshielded. The deshielding exhibited by the closest carbons to the oxygen cause the carbons farther out to become shielded, shifting their absorption signals upfield.