The crystal structures of a series of precursor dialcohols (I - III) with a dibenzo-subunit were investigated. In I and III, the pendant alcohol groups show anti orientations, which are opposite to that in II. It is of interest to see whether upon extending the molecule from -O(CH2)1O- (I) to -O(CH2)3O- (III) the intermolecular H-bonding effect on the molecular conformation becomes more important
