Scheme 1. General multi-step reaction for the synthesis of disulfides starting from alcohols. (a) 1 eq. of methanesulfonyl chloride and 1 eq. of triethylamine in CH₂Cl₂. (b) 1.5 eq. of thioacetic acid and 3 eq. of potassium carbonate in water. (c) Acidic methanol. (d) 5% iodine in methanol.