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Chemistry 125: review session April 6, 2011 This slide was used in reviewing NMR. The corresponding portion of the Audio file comes between 1:58 and 2:13. This For copyright notice see final page of this file

Question 8 diastereotopic ! enantiotopic ? enantiotopic different  C H D C C N H D B A same  (unless chiral, resolved solvent) enantiotopic no mirror plane mirror plane TMS D B C Could this 3 Hz doublet be due to long-range splitting by A? (> 3 Hz for larger field) different  There is no reciprocal 3 Hz quintet for A! Just the 7 Hz triplet from C! 1:3:3:1 7 Hz 1:2:1 Question 8