1HNMR Protons on alkenyl sp2 carbons are somewhat deshielded and fall in the range of 4.0 to 7.0 ppm. They can have complex splitting patterns due to the different environments possible for these types of protons .
propene Zoom In : click+drag Zoom Out : double-click Slide : shift+drag Scale : scroll (mousewheel) Cis and trans coupling appear differently on 1HNMR spectrum . Typically, the coupling constant (J) is 6-14 Hz for vicinal cis protons and 11-18 Hz for trans.
The following two spectra are for C3H5OCl. See if you can determine the structures, and which is cis/trans spectra? If the NMR that was used for these was 300 MHz, what is the coupling constant for the cis and trans isomers?
Zoom In : click+drag Zoom Out : double-click Measure here! Alkene FTIR Alkenes have characteristic adsorptions from sp3-1. The C=C appears around 890 cm-1.