The Baeyer-Villiger oxidation represents a worthwhile response that permits the conversion of ketones into esters or lactones. Right here, we current a novel and environment friendly method using I2 as a catalyst for the oxidative rearrangement of cyclobutenones, ensuing within the synthesis of furan-2(5H)-one. Notably, this methodology employs dimethyl sulfoxide (DMSO) as a greener oxidant and supply of oxygen. The response proceeds easily with catalytic quantities of iodine, yielding lactones in good yields. In comparison with typical Baeyer-Villiger oxidation reactions that depend on peroxyl acids or hydrogen peroxide, the usage of DMSO gives a safer and extra versatile various.