Appendix 1

Continue with Appendix 2

Hydrocarbon parent components in order of decreasing seniority.

1	Polyphenylene	(C6)m .C2m	cf. 33 (m > 8)	(see FR-2.1.5)
2	Polynaphthylene	(C6)2k .C2k	cf. 25 (k > 4)	(see FR-2.1.6)
3	Polyacene	(C6)n	cf. 39 (n > 10)	(see FR-2.1.2)
4	Polyaphene	(C6)n	cf. 31 or 35 (n > 10)	(see FR-2.1.3)
5	Polyhelicene	(C6)n	cf. 32 (n > 9)	(see FR-2.1.7) Note a
6	Nonaphenylene	(C6)9.C18	cf. 33 (m = 9)	(see FR-2.1.5)
7
8	Decacene	(C6)10	cf. 39 (n = 10)	(see FR-2.1.2)
9	Decaphene	(C6)10	cf. 31 (n = 10)	(see FR-2.1.3)
10	Ovalene	(C6)10
11	Decahelicene	(C6)10	cf. 32 (n = 10)	(see FR-2.1.7) Note a
12	Octaphenylene	(C6)8.C16	cf. 33 (m = 8)	(see FR-2.1.5)
13	Tetranaphthylene	(C6)8.C8	cf. 25 (k = 4)	(see FR-2.1.6)
14	Nonacene	(C6)9	cf. 39 (n = 9)	(see FR-2.1.2)
15	Nonaphene	(C6)9	cf. 35 (n = 9)	(see FR-2.1.3)
16	Nonahelicene	(C6)9	cf. 32 (n = 9)	(see FR-2.1.7) Note a
17	Heptaphenylene	(C6)7.C14	cf. 33 (m = 7)	(see FR-2.1.5)
18	Octacene	(C6)8	cf. 39 (n = 8)	(see FR-2.1.2)
19	Octaphene	(C6)8	cf. 31 (n = 8)	(see FR-2.1.3)
20	Pyranthrene	(C6)8
21	Octahelicene	(C6)8	cf. 32 (n = 8)	(see FR-2.1.7) Note a
22	Hexaphenylene	(C6)6.C12	cf. 33 (m = 6)	(see FR-2.1.5)
23	Heptacene	(C6)7	cf. 39 (n = 7)	(see FR-2.1.2)
24	Heptaphene	(C6)7	cf. 35 (n = 7)	(see FR-2.1.3)
25	Trinaphthylene	(C6)7		(see FR-2.1.6) Three naphthalene systems - hence k = 3
26	Coronene	(C6)7
27	Heptahelicene	(C6)7	cf. 32 (n = 7)	(see FR-2.1.7) Note a
28	Rubicene	(C5)2.(C6)5
29	Pentaphenylene	(C6)5.C10	cf. 33 (m = 5)	(see FR-2.1.5)
30	Hexacene	(C6)6	cf. 39 (n = 6)	(see FR-2.1.2)
31	Hexaphene	(C6)6		(see FR-2.1.3) six rings hence n = 6
32	Hexahelicene	(C6)6		(see FR-2.1.7) Note a six rings hence n = 6
33	Tetraphenylene	(C6)4.C8		(see FR-2.1.5) four benzene rings hence m = 4
34	Pentacene	(C6)5	cf. 39 (n = 5)	(see FR-2.1.2)
35	Pentaphene	(C6)5		(see FR-2.1.3) five rings hence n = 5
36	Perylene	(C6)5
37	Picene	(C6)5
38	Pleiadene	(C6)3.C7
39	Tetracene	(C6)4		(see FR-2.1.2) Note b four rings hence n = 4
40	Tetraphene	(C6)4	cf. 35 (n = 4)	(see FR-2.1.3)
41	Chrysene	(C6)4
42	Pyrene	(C6)4
43	Triphenylene	(C6)4
44	Aceanthrylene	C5.(C6)3
45	Acephenanthrylene	C5.(C6)3
46	Fluoranthene	C5.(C6)3
	Note c
47	Anthracene	(C6)3		Note a
48	Phenanthrene	(C6)3		Note d
49	Phenalene (1H-form shown)	(C6)3
50	Fluorene (9H-form shown)	C5.(C6)2
51	Acenaphthylene	C5.(C6)2
52	Biphenylene	C4.(C6)2		Note e
53	s-Indacene	(C5)2.C6		Note e
54	as-Indacene	(C5)2.C6		Note e
55	Polyalene	(Cn)2 (n > 6)		Heptalene (n = 7) shown (see FR-2.1.4)
56	Azulene	C5.C7
57	Naphthalene	(C6)2
58	Indene (1H-form shown)	C5.C6
59	Pentalene	(C5)2		(see FR-2.1.4)
60	Polyalene	(Cp)2	cf. 50 (p = 3 or 4)	(see FR-2.1.4)
61	[p]Annulene	Cp (p > 6)		Note f
62	Benzene	C6
63	[p]Annulene	Cp (p < 6)		Note g

Notes

a. Non-standard numbering.

b. Formerly called naphthacene which is still used by CAS and Beilstein.

c. CAS and Beilstein includes trindene (cyclopenta[e]-as-indacene).

d. Non-standard orientation, hence non-standard numbering.

e. In the previous edition of these rules (rule A-21.1, ref 3) indacene was preferred to biphenylene. This is now reversed to follow FR-2.3.c (see also Table 20, ref 3a).

f. These names only apply for a parent component; otherwise cycloalka is used as a fusion prefix (see FR-2.1.1).

g. Only [5]annulene may be used as a parent e.g. cyclobuta[1,2:3,4]di[5]annulene. The prefix cycloalka- is used for attached components (see FR-2.1.1).

3. IUPAC Nomenclature of Organic Chemistry, Sections A and B, 1st edition, 1958; 2nd edition, 1966; 3rd edition (combined with section C), 1971; 4th edition (combined with sections C, D, E, F and H), 1979.

3a. A Guide to IUPAC Nomenclature of Organic Compounds, Recommendations 1993, Blackwell Scientific Publications, 1993.

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