Reaction of 4‐substituted thiosemicarbazides with (2,4,7‐trinitro‐9<i>H</i>‐fluoren‐9‐ylidene)propanedinitrile

Abstract

Abstract magnified image 4‐Substituted thiosemicarbazides 4a‐c reacted with (2,4,7‐trinitro‐9 H ‐fluoren‐9‐ylidene)‐propanedinitrile ( 2 ) in pyridine with admission of air to form spiro[fluorene‐9,3′‐(1,2,4‐triazole)]derivatives 5a‐c and (4‐substituted thiosemicarbazono)propanedinitriles 6a‐c in modest yields. 2,4,7‐Trinitro‐9‐fluorenone ( 8 ) as well as one reduction product thereof and of 2 , namely compounds 9 and 10 , respectively are also found. A rationale for the conversions observed is presented.