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The 13C NMR chemical shifts of 74 N‐acylated 2‐aminobenzimidazoles were determined and assigned. The chemical shifts are discussed as a function of electronic and spatial substituent effects. Line broadening for certain C signals are traced to prototropy at N‐1 and N‐3, and N‐3 and Nexo.
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Gründemann et al. (1986) studied this question.
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