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. 2009 Apr 1;130(13):134503. doi: 10.1063/1.3092908

Figure 4.

Figure 4

13C CPMAS NMR spectra of (a) reaction products of H13C15N in the presence of catalytic triethylamine (sample C, 2178 scans). (b) Natural abundance DAMN (Fig. 3) (4480 scans). (c) Reaction products of H13C15N in the presence of catalytic hydroquinone and triethylamine (sample A, 2048 scans). (d) Reaction products of H13C15N in the presence of catalytic benzoquinone and triethylamine (sample B, 2048 scans). (e) Reaction products of H13C15N mixed with 10 vol % acetaldehyde in the presence of catalytic triethylamine (sample I, 4480 scans). Asterisks mark spinning sidebands.