2‐Acyl(aroyl)‐1,1,3,3‐tetracyanopropenides. Part 1. Synthesis of 2‐[5‐Amino‐2‐aryl‐2‐chloro‐4‐cyanofuran‐3(2H)‐ylidene] ‐propanedinitriles (III) by Reaction of Potassium 2‐Aroyl‐1,1,3,3‐tetracyanopropenides (II) with Concentrated Hydrochloric Acid.