Chapter 30.SE, Problem 12VC

Interpretation Introduction

Interpretation:

The ¹³CNMR spectrum of homotropilidene taken at room temperature shows three peaks.

Concept introduction:

Carbon-13 (C13) nuclear magnetic resonance (most commonly known as carbon-13 NMR or ¹³C NMR or sometimes simply referred to as carbon NMR) is the application of nuclear magnetic resonance (NMR) spectroscopy to carbon. It is analogous to proton NMR (¹HNMR) and allows the identification of carbon atoms in an organic molecule just as proton NMR identifies hydrogen atoms. As such ¹³CNMR is an important tool in chemical structure elucidation in organic chemistry. ¹³CNMR detects only the ¹³C isotope of carbon, whose natural abundance is only 1.1%, because the main carbon isotope, ¹²C, is not detectable by NMR since it has zero net spin.

¹³C chemical shifts follow the same principles as those of ¹H, although the typical range of chemical shifts is much larger than for ¹H.