Characterization and analysis Esters are generally identified by gas chromatography, taking advantage of their volatility. IR spectra for esters feature an intense sharp band in the range 1730–1750 cm−1 assigned to νC=O. This peak changes depending on the functional groups attached to the carbonyl. For example, a benzene ring or double bond in conjunction with the carbonyl will bring the wavenumber down about 30 cm−1.
characterization and analysis esters are generally identified by gas chromatography taking advantage of their volatility ir spectra for esters feature an intense sharp band in the range 1730–1750 cm−1 assigned to νc=o this peak changes depending on the functional groups attached to the carbonyl for example a benzene ring or double bond in conjunction with the carbonyl will bring the wavenumber down about 30 cm−1