![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
N bonds of E- and Z-amidines The unstable Z-formamidines are ‘frozen’ in the perpendicular configuration (6); ready isomerisation [via the conjugate acid (4)] occurs to the E-form (2).
![[double bond, length half m-dash]](https://www.rsc.org/images/entities/h2_char_e006.gif)
N bonds of E- and Z-amidines
A. F. Hegarty and A. Chandler, J. Chem. Soc., Chem. Commun., 1980, 130 DOI: 10.1039/C39800000130
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