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.
See Recommendations'93 R-2.4.3
Examples to Rule B-11.1
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