In a 300-MHz NMR spectrometer, absorption of radiation at 1500 Hz corresponds to

Question

In a 300-MHz NMR spectrometer, absorption of radiation at 1500 Hz corresponds to a chemical shift of ___ ppm. Show calculation. (b) The frequencies in (a) are in the ______ frequency range of the electromagnetic spectrum. (c) The chemical shifts () are caused by deshielding of the ______ compared to TMS (tetramethyl silane). Define deshielding and tell how the amount of deshielding affects. 6. Arrange these methyl group hydrogens from smallest to largest chemical shift. R is any alkyl group. Write 5 values for each one that is available.

Explanation / Answer

Ans - CH3Cl = 3.05 pm

CH3OH = 3.47 pm

R-CH3 = .8-1.0 pm

CH3COCH3 = 2.1 -2.3 pm

the order is

CH3OH > CH3Cl > CH3CH2Cl >CH3COCH3 >R-CH3

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