Please Clearly explain and show how the structures are obtained. NMR is by far t

Question

Please Clearly explain and show how the structures are obtained. NMR is by far the most confusing topic I'm learning. Thank you so much!

(10) The below, are both ketones. One of the samples samples A and B, whose IH NMR are given A or B contains 5 contains spectra it is not clear whether carbons. 5 carbons, the other contains 7 carbons. However, Propose full structures for A and B TTT TTTT TTTTT TTTTTTT-TTTT-TT-TT-TT-TTTTTTTTT TTTT TTTT T 2.6 2.0 TTT TTTTTTTTTTTTT TTTTTTT TTTTTTTT Tr TTTTT TTrm TT

Explanation / Answer

The structure of A having five carbons and B having seven carbons is the same as given. The corresponding spectra isalso correct for A and B.

For structure A:

The quartet at 2.5 ppm corresponds to the CH3-CH2-CO-

The triplet at 1.1 ppm corresponds to the CH3-CH2-CO-

For structure B:

The singlet at 2.1 ppm corresponds to the CH3-CO-

The singlet at 1.2 ppm corresponds to the two CH3's attached to the carbon Me2-C-CO-

The quartet at 1.5 ppm corresponds to the Me2-C-CH2-CH3

The triplet at 1.0 ppm corresponds to the Me2-C-CH2-CH3

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