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Nmr spectrum chemical shift
The protons of alkenes are deshielded and their signals appear downfield from the saturated C-H protons in the ppm range. Compare the data in the table below. And so there's a reason why we do that. Schaeffer, Jr. Duddeck, W. Shaw, Elsevier Scientific Publishing Co. Chemical applications of NMR. It is a sketch of a proton nmr spectrum included in Becker, Chapter 1.