The present disclosure relates to 1,3,5-dioxazine derivatives of formula (I) capable of reducing or eliminating hydrogen sulfide and other objectionable sulfides from oil field produced hydrocarbon fluids such as petroleum, fuel oil, gasoline, diesel, liquid propane, liquid butane, an aquaculture and production/processing of syngas/natural gas. The present disclosure further provides a method for preparing 1,3,5-dioxazine derivatives of formula I, and a method for scavenging sulfur-based species including, but not limited to hydrogen sulfide or alkyl/aryl mercaptans from a medium.