NOMENCLATURE OF REGULAR DOUBLE-STRAND (LADDER AND SPIRO) ORGANIC POLYMERS

Structure-based and source-based nomenclature rules are extended to regular double-strand (ladder and spiro) organic polymers. A double-strand polymer is defined as a polymer the molecules of which are formed by an uninterrupted sequence of rings with adjacent rings having one atom in common (spiro polymer) or two or more atoms in common (ladder polymer). The structure-based nomenclature rests upon the selection of a preferred constitutional repeating unit (CRU) of which the polymer is a multiple. Rules are also provided for denoting substituents and end groups. The source-based nomenclature identifies the starting monomer(s) from which the double-strand polymer is prepared with addition of an appropriate prefix ''ladder-'' or ''spiro-''.