Synthesis of cyclic gem-dinitro compounds via radical nitration of 1,6-diynes with Fe(NO)·9HO.

Cyclic gem-dinitro compounds were obtained via nitration of 1,6-diynes using Fe(NO3)3·9H2O as the nitrating agent. The reaction proceeds at room temperature using a cheap nitrating agent. A number of gem-dinitro cyclic compounds were obtained in moderate to good yields. The reaction offers an easy and convenient protocol to prepare gem-dinitro compounds, which are not easily obtained via the known procedures.