Answer the questions with respect to the spectrashown below. . peak ___________

Question

Answer the questions with respect to the spectrashown below. .

peak

___________ How many different (non-equivalent) carbonatoms are apparently in the molecule?

___________ Is there a >C=O group present? If so,what is the range of its absorbance?

___________ Are there any aromatic carbons present? Ifso, what is the range of the absorbance?

ppm              splittingpattern             number of attached hydrogens

171        s

134        s

129        d

128        d

127        d

60         t

41         t

13         q

Explanation / Answer

     The C13 NMRdetermines the number of carbons which are in differentenvironment         Their are sixcarbon atoms which are in different environment          The C=O group in the molecule is confirmed by the point ofthe absorption around 171 ppm           The aromatic carbons corresponds to the value near 127 -129 ppmthey are three set of carbons in the            C13 NMR              For 171 ppm    ---- s   indicates noproton                      134 ppm    ---- s   indicates noproton                       129 ppm   ----- d    indicate 1proton                       128 ppm    ----- d    indicate1 proton                         127 ppm   ------ d    indicate 1proton                          60 ppm   ------   t indicates 2proton                           41 ppm    ------ t indicates 2 proton                             13 ppm ------ q indicates 3 proton

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