“…46,56,58,61,65,[71][72][73]79 In 1972 Ioffe and co-workers80 suggested using the silyl esters of nitronic acids as a 1,3-dipolar component, which unlike their alkyl analogues is stable and retains the ability of cycloaddition to olefins. [81][82][83][84][85][86][87][88][89][90][91][92] The intramolecular reactions of the nitronate group with double bonds are known too. For instance, the interaction of tetranitromethane with one of the double bonds of hexa-1,5-diene gives a nitronic ester which is then added to the other double bond forming bicyclic compound 2 (Scheme l).…”