2‐Acyl(aroyl)‐1,1,3,3‐tetracyanopropenides. Part 2. Synthesis of 2‐[2‐(Alkylsulfanyl)‐5‐amino‐2‐aryl‐4‐cyano‐2,3‐dihydrofuran‐3‐ylidene] propanedinitriles by Reactions with Thiols.