Bring the power of IUPAC naming to your desktop!

ACD/Name (Chemist Version) offers a standardized set of features for quick and simple generation of IUPAC names, and structures from names. It is a streamlined version of our popular ACD/Name software.

View a full description and pricing on our web store.

Principles of Organic Nomenclature

R-1.2.4 Conjunctive operation

The conjunctive operation involves the formal construction of the name of a compound from those of its components with abstraction of the same number of hydrogen atoms from each component at each site of conjunction. This operation may be expressed:

R- By juxtaposition of component names. This method is most commonly used when the two components to be joined are: (a) a ring or a ring system; and (b) carbon chain (or chains) substituted by a principal characteristic group. In this method, both the principal characteristic group and the ring or ring system must terminate the chain; the rest of the structure attached to the chain, if any, is described by substituent prefixes, the location of which is indicated by Greek letter locants, , , etc., ( designating the atom next to the principal characteristic group).

Examples to R-

R- By placing a multiplicative prefix [such as "bi-", "ter-", etc. (see R-], before the name of the corresponding parent hydride (see R-2.4.4)

Examples to R-

R-1.2.5 Subtractive operation
R-1.2.6 Ring formation or cleavage
R-1.2.7 Rearrangement
R-1.2.8 Multiplicative operation

This HTML reproduction is as close as possible to the published version [see IUPAC, Commission on Nomenclature of Organic Chemistry. A Guide to IUPAC Nomenclature of Organic Compounds (Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.

Published with permission of the IUPAC by Advanced Chemistry Development, Inc.,, +1(416)368-3435 tel, +1(416)368-5596 fax. For comments or suggestions please contact