Bridged Hydrocarbons

Rule A-32. Polycyclic Systems

The appropriate prefix "tricyclo-", "tetracyclo-", etc., is substituted for "bicyclo-" before the name of the open-chain hydrocarbon containing the same total number of carbon atoms. Radicals derived from these hydrocarbons are named according to the principles set forth in Rule A-31.4.

32.12 - A polycyclic system is regarded as containing a number of rings equal to the number of scissions required to convert the system into an open-chain compound.

32.13 - The word "cyclo" is followed by brackets containing, in decreasing order, numbers indicating the number of carbon atoms in:

the two branches of the main ring,

the main bridge,

the secondary bridges.

Examples to Rule A-32.13

32.22 - The location of the other or so-called secondary bridges is shown by superscripts following the number indicating the number of carbon atoms in the said bridges.

32.23 - For the purpose of numbering, the secondary bridges are considered in decreasing order. The numbering of any bridge follows from the part already numbered, proceeding from the highest-numbered bridge head. If equal bridges are present, the numbering begins at the highest. numbered bridgehead.

32.31 - When there is a choice, the following criteria are considered in turn until a decision is made:

(a) The main ring shall contain as many carbon atoms as possible, two of which must serve as bridgeheads for the main bridge.

Examples to Rule A-32.31(a)

Examples to Rule A-32.31(b)

Examples to Rule A-32.31(c)

Examples to Rule A-32.31(d)

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Hydrocarbon Bridges