Rule B-11. Compounds: Method 2

Heterocyclic Spiro Compounds

Rule B-11. Compounds: Method 2

11.1 - Heterocyclic spiro compounds are named according to Rule A-42, the following criteria being applied where necessary:(a) spiro atoms have numbers as low as consistent with the numbering of the individual component systems; (b) heterocyclic components have priority over homocyclic components of the same size; (c) priority of heterocyclic components is decided according to Rule B-3. Parentheses are used where necessary for clarity in complex expressions.

Examples to Rule B-11.1

Cyclohexanespiro-2'-(tetrahydrofuran)

Tetrahydropyran-2-spirocyclohexane

3,3'-Spirobi(3H-indole)

1,2,3,4-Tetrahydroquinoline-4-spiro-4'-piperidine

Hexahydroazepinium-1-spiro-1'-imidazolidine-3'-
spiro-1''-piperidinium dibromide

See Recommendations'93 R-2.4.3

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