Alphabetical order is used for any combination of the prefixes cyclo, homo, nor and seco; they are placed after any prefixes denoting substituents and befor any stereochemical prefixes required by Rule 2S-1.5, or, if there are none of the latter, then immediately before the stem name.

This HTML reproduction of Sections A, B and C of IUPAC "Blue Book" is as close as possible to the published version [see Nomenclature of Organic Chemistry, Sections A, B, C, D, E, F, and H, Pergamon Press, Oxford, 1979. Copyright 1979 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