The constitution of the product formed in the reaction between phos- phorus pentachloride and an N,N'-dialkyloxamide (I) 1. ... The constitutions of isomers A and B were proved by the following series of reactions. Each isomer was separately nitrated, and the nitrochloro derivatives (IIIa and IIIb) treated with sodium cyanide in dimethyl sulfo- xide s. The resulting nitrocyano compounds (IVa and IVb) were converted ... 0 . Wallach, Ann. 184, 33, (1877). 0 . Wallach, Ann. 214, ...