Alkyl substitution on the amino nitrogen, vinylogy (but not benzology), iminology, and alkyl substitution on the functional carbon of the amidine skeleton in cyanamide iminologues increase the hydrogen-bonding basicity of cyanamide and produce, on the pKHB scale, super-basic nitriles more basic than tertiary amines. On the gas-phase basicity scale iminology also increases the basicity of cyanamide, but sp-nitrogen bases remain less basic than sp2- or sp3-nitrogen bases.
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Berthelot et al. (1993) studied this question.