Two series of new ferroelectric liquid-crystalline diols with 1,3-propandiol group connected by a flexible spacer to the mesogenic part of the molecule have been synthesized. Both series are laterally substituted by methyl, methoxy, or chlorine substituents in. the meta position to the carboxylic group of the 4-alkoxybenzoate unit. Phases and phase-transition temperatures were determined by polarizing microscopy and Differential Scanning Calorimetry (DSC). Mesomorphic properties of the studied compounds are compared and the effect of lateral. substitution is evaluated. These new series of diols are predestined for preparation of liquid, crystalline polyurethanes by bulk polymerization in the temperature range of the SmC* phase.