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SummaryTo shed light on dramatic differences between dl- and meso-1,3-bis(hydroxyphenylmethyl)benzenes in the solvent-free polycondensation, which takes place below the melting point of each monomer and gives the polyether, IR spectroscopic study of these monomers has been performed at variable temperature. The dl monomer proved to have stronger hydrogen-bonding networks in the crystalline state than...