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13.11 - In an acyclic compound, that chain upon which the nomenclature and numbering are based is called the "principal chain". When in an acyclic compound there is a choice for principal chain, the following criteria are applied successively, in the order listed, until a decision is reached:
(a) Maximum number of substituents corresponding to the principal group.
(b) Maximum number of double and triple bonds considered together.Example to Rule C-13.11(a)
(c) Maximum length.Example to Rule C-13.11(b)
(d) Maximum number of double bonds.Example to Rule C-13.11(c)
(e) Lowest locantsExample to Rule C-13.11(d)
for the principal groups (that is, for the suffix).
(f) Lowest locants for multiple bonds.Example to Rule C-13.11(e)
(g) Lowest locants for double bonds.Example to Rule C-13.11(f)
(h) Maximum number of substituents cited as prefixes.Example to Rule C-13.11(g)
(i) Lowest locants for all substituents in the principal chain cites as prefixes.Example to Rule C-13.11(h)
(j) The substituent first cited in alphabetical order.Example to Rule C-13.11(i)
(k) Lowest locants for the substituent cited first as prefix in alphabetical order (see Subsection C-0.16).Example to Rule C-13.11(j)
Example to Rule C-13.11(k)
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