1. The C-NMR spectrum of triphenylmethanol shows three peaks inthe 120 - 165 ppm range and one peak at 82.3 ppm, however theunusally tall peak at 127.9 ppm is a very rare case of twooverlapped peaks that are so exactly overlapped they are seen asone. Draw the structure of triphenylmethanol showing which C's areequivalent and which are inequivalent and indicate the plane ofsymmetry (or rotational exchanges) that exchange equivalent C's inthe molecule. Which carbon in triphenylmethanol causes the peak at82.3 ppm?

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

Transcribed Image Text:

Normalized Intensity 1.0- 0.9 0.8- 0.7- 0.6- 0.5- 0.4- 0.35 0.2- 0.1- 0 CARBON_01 200 180 160 -145.82 140 -127.92 127.26 Chemical Shift (ppm) 77.33 77.01 76.69 80 8 60 40 20 Normalized Intensity 1.0- 0.9 0.8- 0.7- 0.6- 0.5- 0.4- 0.35 0.2- 0.1- 0 CARBON_01 200 180 160 -145.82 140 -127.92 127.26 Chemical Shift (ppm) 77.33 77.01 76.69 80 8 60 40 20

Answer rating: 100% (QA)

Answer 4 13 C peaks a 823 ppm b d1466 PPM d OH The 4 1272 ppm C 1279 ppm ... View the full answer