Question

1. The C-NMR spectrum of triphenylmethanol shows three peaks in the 120 - 165 ppm range and one peak at 82.3 ppm, however the unusally tall peak at 127.9 ppm is a very rare case of two overlapped peaks that are so exactly overlapped they are seen as one. Draw the structure of triphenylmethanol showing which C's are equivalent and which are inequivalent and indicate the plane of symmetry (or rotational exchanges) that exchange equivalent C's in the molecule. Which carbon in triphenylmethanol causes the peak at 82.3 ppm?

2. Does the C-NMR spectrum of the below spectrum show product? Is it pure? Are there any unreacted reactants, side products or solvents present?

Answer 1

OH a 82 3 PPm) of c ( 1279 pm) b 12 2 pe) 13 c Peak s ana benzene C82.3 pnctached to ninas wings. d (146-9 ppm) → ipso con, benzene Arts oca the same spot. O H 3 Ph 2 ph "The Ve九戉cal plane that bisects the-oH (Tour motecule. ints hatves that ave mianon images ot ead Carbon atomi aha the lfh group bisect万the n, "tuen

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