Kc. Joshi et al., STRUCTURE OF THE (2-ACETAMIDOBENZOYL)FORMATE ANION AS THE BENZAMIDINIUM SALT, Acta crystallographica. Section C, Crystal structure communications, 50, 1994, pp. 1792-1794
The reaction of isatin with benzamidine hydrochloride in methanol yiel
ds the title compound, benzamidium (2-acetamidobenzoyl)formate (C7H9N2
+.C10H8NO4-). In the benzamidinium cation the configuration about the
exocyclic C atoms is planar, resulting in electron delocalization in t
he C-N bonds. The C-O bond distances in the carboxylate moeity in the
anion are very similar (average C-O = 1.237 Angstrom), indicating delo
calization of the negative charge. Hydrogen bonds are present between
the N atoms of the amidinium group and the O atoms of the carboxylate
moeity of the anion. The N O distances vary between 2.819 (5) and 2.90
1 (5) Angstrom in the hydrogen bonds.