In the title β-thio­carbonyl compound, C16H16O2S, the carbonyl and meth­oxy O atoms are approximately coplanar [O—C—C—O torsion angle = −18.2 (5)°] and syn to each other, and the tolyl ring is orientated to lie over them. The dihedral angle between the planes of the two rings is 44.03 (16)°. In the crystal, supra­molecular chains are formed along the c axis mediated by C—H⋯O inter­actions involving methine and methyl H atoms as donors, with the carbonyl O atom accepting both bonds; these pack with no specific inter­molecular inter­actions between them.

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In the title β-thio­carbonyl compound, C16H16O3S, the adjacent meth­oxy and carbonyl O atoms are synperiplanar [the O—C—C—O torsion angle is 19.8 (4)°] and are separated by 2.582 (3) Å. The dihedral angle between the rings is 40.11 (16)°, and the meth­oxy group is coplanar with the benzene ring to which it is connected [the C—C—O—C torsion angle is 179.1 (3)°]. The most notable feature of the crystal packing is the formation of methine and methyl C—H⋯O(carbon­yl) inter­actions that lead to a supra­molecular chain with a zigzag topology along the c axis. Chains pack with no specific inter­molecular inter­actions between them.

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