chemistry questions and answers. 1H NMR Spectrum Of Cinnamic Acid (600 MHz, CDC13) - 12.19 7.84 7.81 -6.49 -6.47 0.86 0.99Usage: Cinnamic acid is an important substance because it is widely used in perfume, food, photographic, polymer and pharmaceutical industries, as well as for clinical and toxicological Studies.
The NMR signal for H A will appear as a two line pattern as shown in Figure 16. We say the H X splits the absorption H A into a doublet and the two protons are coupled to each other. The intensity of the two lines will be equal since the probability of H X existing in the or states is approximately equal.