IUPAC polymer nomenclature: Difference between revisions

=== Regular single-strand organic polymers ===

In place of the monomer name used in source-based nomenclature, structure-based nomenclature uses that of the '''''preferred''''' constitutional repeating unit (CRU).<ref name=Kahovec2>Kahovec, J.; Fox, R. B.; Hatada, K. (2002). "[http://media.iupac.org/publications/pac/2002/pdf/7410x1921.pdf Nomenclature of Regular Single-Strand Organic Polymers]" ''Pure Appl. Chem.'' '''74''' (10): 1921–1956.</ref> It can be determined as follows: (i) a large enough part of the polymer chain is drawn to show the structural repetition, e.g.,

(ii) the smallest repeating portion is a CRU, so all such possibilities are identified. In this case:

(iii) the next step is to identify the subunits that make up each of these structures, i.e., the largest divalent groups that can be named using IUPAC nomenclature of organic compounds such as the examples that are listed in Table 3; (iv) using the shortest path from the most senior subunit to the next senior, the correct order of the subunits is determined using Figure 1; (v) the preferred CRU is chosen as that with the lowest possible locant(s) for substituents.<br />

[[File:Decision tree for IUPAC polymer nomenclature.png|300px|thumb|'''Figure 1'''. The order of subunit seniority. The most senior is at the top centre. Subunits of lower seniority are found by following the arrows. The type of subunit, be it a <span style="color:#FF0000">'''heterocycle'''</span>, a <span style="color:#F08080">'''heteroatom chain'''</span>, a <span style="color:#0000FF">'''carbocycle'''</span>, or a <span style="color:#00BFFF">'''carbon chain'''</span>, determines the colour arrow to follow. ^a Other heteroatoms may be placed in these orders as indicated by their positions in the periodic table.<ref name = Kahovec2 /> <br />Copyright © IUPAC 2012]]