(2E)-2-(Thio-phen-2-yl-methyl-idene)-1,2,3,4-tetra-hydro-naphthalen-1-one.

In the title compound, C(15)H(12)OS, the cyclo-hexene ring has a twisted boat conformation with the C atom between the ketone and methyl-ene atom and this methyl-ene C atom lying 0.280 (3) and 0.760 (3) Å, respectively, from the plane through the remaining four atoms (r.m.s. deviation = 0.004 Å). The dihedral angle between the benzene and thio-phene rings [21.64 (9)°] indicates an overall twist in the mol-ecule. The thio-phene S and ketone O atoms are anti, an orientation that allows the close approach of these atoms [3.3116 (17) Å] in the crystal structure and which leads to the formation of helical supra-molecular chains along the c axis.