Chemical Nomenclature and Structure Representation Division
For nomenclature purposes, a structure containing at
least one carbon atom is considered to be an organic
compound. The formation of a systematic name for an organic
compound requires selection and then naming of a parent
structure. This basic name may then be modified by
prefixes, infixes, and, in the case of a parent hydride,
suffixes, which convey precisely the structural changes required to
generate the compound in question from the parent structure. In
contrast to such systematic names, there are traditional
names which are widely used in industry and academic
circles. Examples are acetic acid, benzene and pyridine.
Therefore, when they meet the requirements of utility and
when they fit into the general pattern of systematic nomenclature,
these traditional names are retained.
A major new principle is elaborated in these
Recommendations. The concept of ‘preferred IUPAC names’ is
developed and systematically applied. Up to now, the
nomenclature developed and recommended by IUPAC has
emphasized the generation of unambiguous names in accord
with the historical development of the subject. In 1993,
due to the explosion in the circulation of information and the
globalization of human activities, it was deemed necessary to have
a common language that will prove important in legal
situations, with manifestations in patents, export-import
regulations, environmental and health and safety
information, etc. However, rather than recommend only a
single ‘unique name’ for each structure, we have developed
rules for assigning ‘preferred IUPAC names’, while
continuing to allow alternatives in order to preserve the diversity
and adaptability of the nomenclature to daily activities in
chemistry and in science in general.
Thus, the existence of preferred IUPAC names does
not prevent the use of other names to take into account a
specific context or to emphasize structural features common
to a series of compounds. Preferred IUPAC names belong to
‘preferred IUPAC nomenclature’ Any name other than a
preferred IUPAC name, as long as it is unambiguous and
follows the principles of the IUPAC recommendations herein, is
acceptable as a ‘general’ IUPAC name, in the context of
‘general’ IUPAC nomenclature. The concept of preferred IUPAC
names is developed as a contribution to the continuing evolution of
the IUPAC nomenclature of organic compounds. This book
(Recommendations 2004) covers and extends the principles,
rules and conventions described in two former publications:
Nomenclature of Organic Chemistry, 1979 Edition and A
Guide to IUPAC Nomenclature of Organic Compounds, Recommendations
1993. In a few instances, the 1979 rules and the 1993
recommendations have been modified to achieve consistency
within the entire system. In case of divergence among the
various recommendations, Recommendations 2004 prevail.
Download full text of the Provisional Recommendations from the contents below. Alternatively, and to facilitate full text searching, the whole volume as single pdf is also available [pdf - 10.34MB].
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