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DEPT stands for Distortionless Enhancement by Polarization Transfer. It is a specialized technique used in ^13C NMR spectroscopy to distinguish different types of carbon atoms according to the number of hydrogen atoms directly attached to them. Conventional broadband-decoupled ^13C NMR spectra generally show one signal for each chemically non-equivalent carbon atom, but they do not directly indicate whether a carbon is a CH₃, CH₂, CH, or quaternary carbon. DEPT spectroscopy overcomes this limitation by using polarization transfer from ^1H nuclei to ^13C nuclei. Thus, DEPT is particularly useful for determining the carbon–hydrogen framework of an organic molecule and for assigning ^13C NMR signals. The basic principle of DEPT involves the transfer of nuclear magnetization from protons to carbon-13 nuclei. Since ^1H has a much higher gyromagnetic ratio and is naturally more sensitive than ^13C, polarization transfer can considerably enhance the intensity of carbon signals. Radiofrequency pulses are applied to both ^1H and ^13C nuclei in a carefully controlled sequence. The resulting spectrum depends on the pulse angle used in the DEPT experiment. Different pulse angles produce different responses from CH₃, CH₂ and CH groups. A carbon atom without a directly attached hydrogen atom, that is, a quaternary carbon, does not give a DEPT signal because there is no proton from which polarization can be transferred. One of the important features of DEPT is therefore its ability to differentiate protonated carbon atoms. In a normal ^13C{^1H} spectrum, _____ ____ _____ _____ _____ _____ __________ _______ _____.
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