…as in the case of trimethyl oxosulfonium chloride, [(CH3)3S=O]+Cl−, converted from dimethyl sulfoxide and methyl chloride. Like sulfoxides, sulfonium and oxosulfonium salts are chiral and can be isolated in optically active form if the attached carbon groups are all different, as in RR′R″S+ and RR′R″S(=O)+. The first known optically active…
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