Comprehensive ESI-MS and MS/MS analysis of aromatic hydrazones derived from nicotinic acid hydrazide

Ethyl ester/acyl hydrazide-based aromatic sulfonamides: facile synthesis, structural characterization, electrochemical measurements and theoretical studies as effective corrosion inhibitors for mild steel in 1.0 M HCl

“…Protonated hydrazide [M + 2H] 2+ is fragmented to afford the corresponding amide F at m / z = 290 by elimination of NH 3 (loss of 17 Da). 38 Additional fragmentation of F via inductive cleavage of the C–N bond yields the corresponding acylium ion B at m / z = 274 after the loss of NH 3 of 17 Da. 39 Additionally, F can undergo decarbonylation (loss of CO, 28 Da) to produce amine G at m / z = 262.…”