This review article reports new procedures and practical application of the nitro to carbonyl conversion that appeared in the literature after our\ud
comprehensive report published in 2004. Beside traditional and well explored reactant systems, new procedures including the utilization of molecular oxygen and photoredox catalysis have been introduced for the Nef reaction. Of notable interest is the utilizationof the nitro to carbonyl conversion in tandem and cascade processes aimed at the preparation of hetero and carbocyclic derivatives