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Additional resources for System of Nomenclature for Terpene Hydrocarbons: Acyclics, Monocyclics, Bicyclics. (Advances in Chemistry Series 014)

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For unsaturated structures, the position numbers assigned to substituents are governed by the low numbers assigned to the double bonds. Thus, the correct systematic numberings for typical structures that will be named as derivatives of the fundamental saturated ring systems, rather than as derivatives of the larger parent compounds, are: In SYSTEM OF NOMENCLATURE FOR TERPENE HYDROCARBONS; Advances in Chemistry; American Chemical Society: Washington, DC, 1955. NOMENCLATURE FOR T E R P E N E HYDROCARBONS 43 Rule 8.

28 A D V A N C E S IN C H E M I S T R Y SERIES menthane-type monocyclics; actually, with only a few exceptions, the reverse reaction is the usual one in terpene chemistry. However, this report is concerned with nomenclature problems and not with the chemical reactions. ch004 Despite the early recognition of the four fundamental bicyclic structures and the agreement on their class names, no attempts seem to have been made to replace the many historical terpene names for the bicyclic terpene hydrocarbons and their derivatives by simple, logical series of names for each type.

Nor- type names and the bicyclo names, however, are formed systematically, and double bonds are assigned position numbers as low as is con­ sistent with the bridge numbering; these double bond numbers then govern the low numbers assigned to the side chains. All of the bicyclic terpene hydrocarbon structures related to carane, pinane, and bornane can be named, on the basis of recommendations in this report, as derivatives of the nor- compounds. 0^]hexane. The American committees recommend, however, that names based on the complete larger carbon skeletons of the four fundamental types of bicyclics, when they apply, be given preference over the nor- and bicyclo names.

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