6 Construction of the Names of Complex Compounds
Chapters 1,2, and 3 of this book have dealt in some detail with the nomenclature rules for parent structures and the wealth of different functional
compound classes based there upon. The present chapter will recapitulate
once again in a more summary manner the most important directives for
the construction of the complete names of more complex compounds.
This entails a reconsideration of the question of priorities for ring and
chain systems already briefly approached in the pertinent sections of
Chapter 1. Since functional groups must ultimately be included in the
decisions, extension of the priority rules becomes imperative, as will be
shown in the following sections.
6.1
Determination of the Highest Ranked Chain (Main or Senior Chain)
For acyclic compounds the definition of the highest ranked (main, senior)
chain concomitantly determines that chain on which the name is to be
based. For its selection the following criteria are applied sequentially: if the
preceding criterion is inconclusive the next one comes in force.
a) greatest number of most senior characteristic groups,
b) largest number of heteroatoms (for hetero chains named with "a"
nomenclature),
c) largest number of multiple bonds taken together,
d) greatest length,
e) for hetero chains: largest number of most senior hetero atoms (Tables
4,20),
f) largest number of double bonds,
g) for hetero chains: lowest locants for all heteroatoms taken together,
then according to their seniorities (Tables 4,20),
h) lowest locants for the most senior characteristic groups expressed as
suffixes,
i) lowest locants for all multiple bonds taken together,
j) lowest locants for double bonds,
Chapters 1,2, and 3 of this book have dealt in some detail with the nomenclature rules for parent structures and the wealth of different functional
compound classes based there upon. The present chapter will recapitulate
once again in a more summary manner the most important directives for
the construction of the complete names of more complex compounds.
This entails a reconsideration of the question of priorities for ring and
chain systems already briefly approached in the pertinent sections of
Chapter 1. Since functional groups must ultimately be included in the
decisions, extension of the priority rules becomes imperative, as will be
shown in the following sections.
6.1
Determination of the Highest Ranked Chain (Main or Senior Chain)
For acyclic compounds the definition of the highest ranked (main, senior)
chain concomitantly determines that chain on which the name is to be
based. For its selection the following criteria are applied sequentially: if the
preceding criterion is inconclusive the next one comes in force.
a) greatest number of most senior characteristic groups,
b) largest number of heteroatoms (for hetero chains named with "a"
nomenclature),
c) largest number of multiple bonds taken together,
d) greatest length,
e) for hetero chains: largest number of most senior hetero atoms (Tables
4,20),
f) largest number of double bonds,
g) for hetero chains: lowest locants for all heteroatoms taken together,
then according to their seniorities (Tables 4,20),
h) lowest locants for the most senior characteristic groups expressed as
suffixes,
i) lowest locants for all multiple bonds taken together,
j) lowest locants for double bonds,