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Dielectric and electrical properties correlated with the structure analysis have been studied for new crystalline polymer {(C 2 H 10 N 2)(MnCl (NCS) 2) 2 } n. The frequency and temperature dependence of dielectric constant (ε 0), dielectric loss (ε 00) and loss tangent (tanδ) in the temperature range 308-348 K and frequency range 20 to 2 MHz have been made for {(C 2 H 10 N 2)(MnCl (NCS) 2) 2 } n. The Z 0 and Z 00 versus frequency plots are well fitted to an equivalent circuit model.

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In the ethyl­enedi­ammonium dication of the title salt, C2H10N2 2+·Cl−·SCN−, the N—C—C—N torsion angle is 72.09 (12)°. In the crystal, an extensive three-dimensional hydrogen-bonding network, formed by N—H⋯Cl and N—H⋯N hydrogen bonds, holds all the ions together.

Under the conditions of the benzilic acid rearrangement, α,β‐diketobutyryl‐di‐phenylamide (Ia) and ‐N‐methylanilide (Ib) are transformed into tartronic acid derivatives (VI), which decarboxylate to lactamides VII. It is proved by 14‐labelling of Ia, that the reaction takes place by carbonamide group migration. The reaction was followed kinetically by polarography at a fixed potential; at low pH the velocity is proportional to [OH⊖], at higher pH it becomes independent of [OH⊖], which is explained by complete transformation of I into its hydrate‐anion. The equilibrium between I and its hydrate was measured by UV.‐spectroscopy.