Contents

• FR-0. Introduction
• FR-1. Definitions
  • 1.1 Fusion
    • 1.1.1 Ortho-fused
    • 1.1.2 Ortho- and peri-fused
    • 1.1.3 Fusion atom
    • 1.1.4 Peripheral atom
    • 1.1.5 Bridgehead atom
    • 1.1.6 Interior atom
  • 1.2 Fused ring system
    • 1.2.1 Bridged fused ring system
    • 1.2.2 Multiparent name
    • 1.2.3 Multiplicative prefix name
  • 1.3 Components of a fused ring system
    • 1.3.1 Parent component
    • 1.3.2 Attached component(s)
    • 1.3.3 Interparent component(s)
  • 1.4 Bridges
    • 1.4.1 Simple bridge prefix
    • 1.4.2 Composite bridge prefix
    • 1.4.3 Bivalent bridge
    • 1.4.4 Polyvalent bridge
    • 1.4.5 Independent bridge
    • 1.4.6 Dependent bridge
• FR-2. Ring Systems Used as Components
  • 2.1 Hydrocarbon components
    • 2.1.1 Monocyclic hydrocarbon components
    • 2.1.2 Polyacene components
    • 2.1.3 Polyaphene components
    • 2.1.4 Polyalene components
    • 2.1.5 Polyphenylene components
    • 2.1.6 Polynaphthylene components
    • 2.1.7 Polyhelicene components
    • 2.1.8 Ace....ylene components
    • 2.1.9 Trivially named hydrocarbon components
  • 2.2 Heterocyclic components
    • 2.2.1 Heteromonocyclic components
    • 2.2.2 Heteranthrene components
    • 2.2.3 Pheno....ine components
    • 2.2.4 Diazanaphthalene and diazaphenanthrene components
    • 2.2.5 Trivially named polycyclic, nitrogen-heterocyclic components
    • 2.2.6 Components formed by replacement of nitrogen by arsenic or phosphorus
    • 2.2.7 Trivially named polycyclic, chalcogen-heterocyclic components
    • 2.2.8 Heterobicyclic components with a benzene ring
  • 2.3 Priority order of component ring systems
  • 2.4 Natural products and fullerenes
• FR-3. Construction of Fusion Names
  • 3.1 Ortho- or ortho- and peri-fused systems
  • 3.2 Selection of components
  • 3.3 Selection of parent component(s)
    • 3.3.1 Order of preference between locations for parent components
  • 3.4 Selection of attached component(s)
    • 3.4.1 Order of preference between attached components
  • 3.5 Heterobicyclic compounds with a benzene ring as a component
  • 3.6 Order of citation of fusion prefixes
• FR-4. Fusion Descriptors
  • 4.1 Identification of sides of parent components
  • 4.2 Identification of sides of attached components
  • 4.3 Fusion of a first-order attached component to the parent component
  • 4.4 Fusion of a higher-order attached component to an attached component
  • 4.5 Choice of locants
  • 4.6 Omission of locants
    • 4.6.1 Unnecessary locants
    • 4.6.2 Locants of peripheral fusion carbon atoms of a component
  • 4.7 Elision
  • 4.8 Heteroatom locants of components
  • 4.9 Treatment of identical attached components
    • 4.9.1 Additional components attached to a system with a multiplicative prefix
    • 4.9.2 Groups of identical components with identical fusion
• FR-5. Numbering
  • 5.1 Drawing of fused ring system for orientation
    • 5.1.1 Allowable shapes for component rings in the horizontal row
    • 5.1.2 Allowable shapes for other component rings
    • 5.1.3 Overlap of bonds
    • 5.1.4 Overlap of rings
    • 5.1.5 Distorted ring shapes
    • 5.1.6 Fusion to an elongated bond
  • 5.2 Orientation
  • 5.3 Peripheral numbering
  • 5.4 Order of preference between alternative numbering
  • 5.5 Interior numbering
    • 5.5.1 Heteroatoms
    • 5.5.2 Carbon atoms
• FR-6. Multi-Parent Systems
  • 6.1 Multi-parent systems with one interparent component
  • 6.2 Additional attached components
  • 6.3 Multi-parent systems with three or more interparent component
• FR-7. Three Components ortho- and peri-Fused Together
  • 7.1 Use of replacement nomenclature
    • 7.1.1 Use of less preferred hydrocarbon parent component
  • 7.2 Use of bridging nomenclature
• FR-8. Bridged Fused Ring Systems
  • 8.1 Procedure for naming bridged systems
    • 8.1.1 Selection of bridge
    • 8.1.2 Naming of ortho- or ortho- and peri-fused portion
    • 8.1.3 Order of citation of bridges
  • 8.2 Selection of fused ring system to be bridged
  • 8.3 Naming of bridges
    • 8.3.1 Simple bivalent bridges
    • 8.3.2 Simple polyvalent bridges
    • 8.3.3 Composite bridges
    • 8.3.4 Elision
  • 8.4 Naming of bridged fused ring systems
    • 8.4.1 Order of citation of bridges
    • 8.4.2 Attachment locants
    • 8.4.3 Choice of attachment locants
    • 8.4.4 Treatment of identical bridges
  • 8.5 Bridged fused ring systems where replacement nomenclature is used
  • 8.6 Numbering of bridge atoms
  • 8.7 Order of numbering bridges
• FR-9. Indicated Hydrogen
  • 9.1 Maximum number of non-cumulative double bonds
  • 9.2 Localised double bonds
  • 9.3 Citation of indicated hydrogen
    • 9.3.1 Ortho- or ortho- and peri-fused ring systems
    • 9.3.2 Bridged systems
  • 9.4 Partially hydrogenated fused ring stems
• References
• Appendix 1. Hydrocarbon parent components in order of decreasing seniority
• Appendix 2. Heterocyclic parent components in order of decreasing seniority

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