Ch 9 Answers to Problems in Lecture Notes

Ch 9 Answers to - Quiz 9.02 How many different resonances will appear in the 1H NMR spectrum of each of the following compounds O O CH3CH2CCH2COCH3

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4 2 5 Quiz 9.02 How many different resonances will appear in the 1 H NMR spectrum of each of the following compounds? CH 3 CH 2 CCH 2 COCH 3 O = O CH 3 CH 2 OCH 2 CH 3 C=C H H H CH 3 CH 2
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Identify the compound with the indicated molecular formula and H NMR spectrum. This requires that one Fnd “clues” in the NMR shifts and coupling. ±or example, there are 3 signals (3 types of H), one much more deshielded than the others, and two must be next to one another to cause splitting. Because the splitting is a quartet and triplet, the quartet arises from an adjacent set of 3 equivalent H’s and the triplet from an adjacent set of 2 equivalent H’s. Now one tries to Ft these requirements to structure by considering fragments and constitutional isomers. ±or example, a quartet is caused by 3 H’s next to a triplet caused by 2 H’s. Therefore one possibility is X-CH 2 CH 3 . 1 2 3 4 5 6 7 8 9 TMS 3 signals These curves correspond to the the area under each singlet or multiplet !
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This note was uploaded on 03/04/2010 for the course CHEM 322AL at USC.

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Ch 9 Answers to - Quiz 9.02 How many different resonances will appear in the 1H NMR spectrum of each of the following compounds O O CH3CH2CCH2COCH3

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