Subtractive Nomenclature

Rule C-42

42.1 - By a special convention, which should not be extended but has been used particularly for terpenes (compare Rules A-72.1 and A-74.2), "nor-" denotes replacement by hydrogen of all methyl groups attached to a ring system.

Example to Rule C-42.1

See Recommendations'93 R-1.2.5

Subtractive Nomenclature
Rule C-43
Rule C-44


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