Although benzene itself absorbs at 128 ppm in its 13C NMR spectrum, the carbons of

Chapter 17, Problem 17.66

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Although benzene itself absorbs at 128 ppm in its 13C NMR spectrum, the carbons of substituted benzenes absorb either upfi eld or downfi eld from this value depending on the substituent. Explain the observed values for the carbon ortho to the given substituent in the monosubstituted benzene derivatives X and Y. N(CH3)2 113 ppm X Y CHO 130 ppm

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