Tropylation and pyrylation of salts of aliphatic mono-, di-, and trinitro compounds

We have studied the reactions of salts of nitroalkanes with tropylium and 2,6-diphenylpyrylium salts leading to products of C-tropylation and C-pyrylation of the corresponding anions. The only exception is the salt of cyanodinitromethane, which is not tropylated. Splitting off of a HNO₂ molecule from the products of tropylation of nitroalkane anions to prepare nitroheptafulvenes was unsuccessful.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2092–2097, September, 1991.