The structures for the isomers A, B, and C of the compound with molecular formula, C 5 H 11 Br are to be interpreted from the given DEPT 13 C − NMR spectra. Concept introduction: DEPT stands for distortionless enhancement by polarization transfer. DEPT 13 C − NMR is used to indicate the number of hydrogen atoms that are bonded to each carbon while providing the information of chemical shift in a broadband proton-decoupled 13 C − NMR spectrum. The carbon signals in a DEPT spectrum are classified as CH 3 , CH 2 , CH or C accordingly. Presence of the electronegative compounds like halogens or oxygen or sulfur elements will downfield the signal, i.e., the chemical shift will occur at higher δ than the unsubstituted carbons.

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Chapter 9, Problem 14PP

Interpretation Introduction

Interpretation:

The structures for the isomers A, B, and C of the compound with molecular formula, C₅H₁₁ Br are to be interpreted from the given DEPT 13C−NMR spectra.

Concept introduction:

DEPT stands for distortionless enhancement by polarization transfer. DEPT 13C−NMR is used to indicate the number of hydrogen atoms that are bonded to each carbon while providing the information of chemical shift in a broadband proton-decoupled 13C−NMR spectrum. The carbon signals in a DEPT spectrum are classified as CH3,CH2,CH or C accordingly.

Presence of the electronegative compounds like halogens or oxygen or sulfur elements will downfield the signal, i.e., the chemical shift will occur at higher δ than the unsubstituted carbons.

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