Chapter 19, Problem 4Q

Interpretation Introduction

Interpretation: The close resemblance of ¹H and ¹³C spectrum of cyclohexene needs to be explained. The ¹³C spectrum of cyclohexene and cyclohexanol needs to be compared.

Concept Introduction:

Both ¹H spectrum and ¹³C spectrum comes under NMR (nuclear magnetic resonance) spectroscopy. The NMR interpretation has an important role in the identification of molecules. For any unknown compound, its NMR spectra can help in interpreting its structure. NMR spectrum contains splitting pattern, integral areas and coupling constant.

In ¹H spectrum and ¹³C spectrum, chemical shift is basically the Larmor frequency of a nuclear spin to its chemical environment. Generally, tetramethyl silane (TMS) is used as standard to calculate the chemical shift if compounds as the chemical shift for TMS is 0 ppm. In NMR spectrum, protons having same chemical shift due to symmetry within the molecule have chemical equivalence.