100 80 60 40 20 ppm

Figure 7.38

carbons to one of the four categories: Cq, CH, CH2, or CH3. Figure 7.39 shows a stacked plot of spectra obtained on a 0.19 mg sample of a testosterone (steroid) metabolite dissolved in CD3OD. The data were acquired in an overnight run on a Bruker DRX-500, using about three-fourths of the time for the 13 C and the remaining one-fourth divided equally between the DEPT-90 and the DEPT-135 spectra. Because of the theoretical advantage of four times in sensitivity, the DEPT spectra take much less time than the 13C spectrum. The

Testosterone metabolite, (

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