Two compounds i.e.
(S)-N-(2-methylbutyl)-4-[(4′-undecyloxybiphenyl-4-yl)oxycarbonyl]phthalimide and (S)-N-(1-methylpropyl)-4-[(4′-undecyloxybiphenyl-4-yl)oxycarbonyl]phthalimide were synthesised from chiral components (S)-2-methylbutan-1-ol and (S)-2-aminobutane, respectively. Then, the obtained ester imides were treated with Lawesson's reagent yielding monothio- and dithioimides. Liquid crystalline smectic C* phases occurred in all imides and thioimides studied.