A process for the synthesis of Dapsone comprising the following steps: a) a condensation reaction between a compound of formula with a compound of formula to give, directly or via an intermediate, a compound of formula in the presence of a base in an aprotic polar solvent; wherein: - R 1 is selected from the group consisting of H atom and an acetyl group, - X is selected from the group consisting of F, I, Cl and Br, and - R 2 is selected from the group consisting of a linear C 1-10 alkyl and a branched C 1-10 alkyl; b) b.i) - the oxidation reaction to sulfone of a compound of formula, to give a compound of formula and - the hydrolysis reaction of a compound of formula to give a compound of formula in the presence of a base in a solvent; or b.ii) - a saponification reaction of the compound of formula to give the compound of formula (XIII) in the presence of a base in a solvent and - an oxidation reaction to sulfone of the compound of formula (XIII) to give the compound of formula; c) the conversion of the compound of formula, into the corresponding hydroxamic acid of formula by reaction with hydroxylamine hydrochloride, in the presence of a condensing agent in a polar aprotic solvent; d) the Lossen rearrangement reaction of the compound of formula to give the compound of formula (VIII) e) the reaction of the compound of formula (VIII) with: - an alcohol to give a compound of formula wherein R 3 is selected from the group consisting of a C 1-10 linear alkyl and a C 1-10 branched alkyl; or - with water to give the compound of formula f) deprotection of the functional groups of compound of formula or to give Dapsone. a) a condensation reaction between a compound of formula with a compound of formula to give, directly or via an intermediate, a compound of formula in the presence of a base in an aprotic polar solvent; wherein: - R 1 is selected from the group consisting of H atom and an acetyl group, - X is selected from the group consisting of F, I, Cl and Br, and - R 2 is selected from the group consisting of a linear C 1-10 alkyl and a branched C 1-10 alkyl; - R 1 is selected from the group consisting of H atom and an acetyl group, - X is selected from the group consisting of F, I, Cl and Br, and - R 2 is selected from the group consisting of a linear C 1-10 alkyl and a branched C 1-10 alkyl; b) b.i) - the oxidation reaction to sulfone of a compound of formula, to give a compound of formula and - the hydrolysis reaction of a compound of formula to give a compound of formula in the presence of a base in a solvent; or b.ii) - a saponification reaction of the compound of formula to give the compound of formula (XIII) in the presence of a base in a solvent and - an oxidation reaction to sulfone of the compound of formula (XIII) to give the compound of formula; b.i) - the oxidation reaction to sulfone of a compound of formula, to give a compound of formula and - the hydrolysis reaction of a compound of formula to give a compound of formula in the presence of a base in a solvent; or - the oxidation reaction to sulfone of a compound of formula, to give a compound of formula and - the hydrolysis reaction of a compound of formula to give a compound of formula in the presence of a base in a solvent; or b.ii) - a saponification reaction of the compound of formula to give the compound of formula (XIII) in the presence of a base in a solvent and - an oxidation reaction to sulfone of the compound of formula (XIII) to give the compound of formula; - a saponification reaction of the compound of formula to give the compound of formula (XIII) in the presence of a base in a solvent and - an oxidation reaction to sulfone of the compound of formula (XIII) to give the compound of formula; c) the conversion of the compound of formula, into the corresponding hydroxamic acid of formula by reaction with hydroxylamine hydrochloride, in the presence of a condensing agent in a polar aprotic solvent; d) the Lossen rearrangement reaction of the compound of formula to give the compound of formula (VIII) e) the reaction of the compound of formula (VIII) with: - an alcohol to give a compound of formula wherein R 3 is selected from the group consisting of a C 1-10 linear alkyl and a C 1-10 branched alkyl; or - with water to give the compound of formula - an alcohol to give a compound of formula wherein R 3 is selected from the group consisting of a C 1-10 linear alkyl and a C 1-10 branched alkyl; or - with water to give the compound of formula f) deprotection of the functional groups of compound of formula or to give Dapsone.