Proton NMR Spectrum Example

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I have a question. For compound a, why is the 1 H that is bonded to O not the farthest one to the left? If it's directly bonded to such a highly electronegative group, wouldn't the electron shielding effect significantly decrease? Why are the 2 Hydrogens bonded to the carbon that is bonded to O actually the farthest ones to the left?

Same for compound c, wouldn't the 3H on the methyl carbon have less electron shielding effects than the 2H on the Carbon bonded to two other carbons, therefore reversing the two small peaks?

extrastout
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Thank you very much for the clear explanation!

CarleysAngel
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Thank you! That was extremely clear. Thanks so much!

DungNguyen-ktob
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n+1 rule? doesnt it come into consideration?

lynetteart