Abstract: A novel spectral editing technique, which can be referred to as DEPT-(90+45), is described. It is modified from the DEPT-135 pulse sequence by substituting the 135° -pulse by a 90° -pulse and a 45° -pulse. By employing different phase cycles, one can obtain methyl-only spectrum and methylene-only spectrum. The methyl only spectrum is completely free of residual methine and methylene signals. However, the methine-only spectrum (DEPT-90) and the methylene-only spectrum are interfered with substantial residual signals from not-selected carbon-proton groups. As a consequence, DEPT-(90+45) can be very useful for spectral editing in one-dimensional NMR spectroscopy.

Key words: Spectral editing, DEPT, NMR