Pa. Wade et Pa. Kondracki, TRAPPING EVIDENCE FOR 1,2-DINITROSPIROPENTENE, Journal of the Chemical Society, Chemical Communications, (10), 1994, pp. 1263-1264
Photolysis of 1,2-diiodo-1,2-dinitrospiropentanes 1a and/or 1b in the
presence of furan afforded the formal Diels-Alder adduct 2 of 1,2-dini
trospiropentene.