Spiro Hydrocarbons A "spiro union" is one formed by a single atom which is the only common member of two rings. A "free spiro union" is one constituting the only union direct or indirect between two rings
senior. The common atom is designated as the "spiro atom". According to the number of spiro atoms present, the compounds are distinguished as
monospiro-, dispiro-, trispirocompounds, etc. The following rules apply to the naming of compounds containing free spiro unions.
Compounds: Method 1
Compounds: Method 2
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