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Methyl p-tolyl sulfoxide may be used as a catalyst in the preparation of homoallylic alcohols by the allylation of aldehydes with allyltrichlorosilane. It may be used as a ligand in the synthesis of molybdenum chlorocomplexes.

Chemistry Letters, 15, p. 967, 1986
Synthetic Communications, 19, p. 1569, 1989 DOI: 10.1080/00397918908051052
Tetrahedron Letters, 19, p. 3415, 1978

Methyl p-tolyl sulfoxide (MTSO), an alkyl-substituted p-tolyl sulfoxide, is a Lewis base. It behaves as an activator of silicon tetrachloride that is employed in aza-Diels-Alder reaction.