PhI-3. Numbering of Phane Parent Hydrides

PhI-3.3. Numbering of Phane Parent Hydrides

PhI-3.3.1. In a phane parent hydride name, the locants for atoms that do not belong to amplificants are the locants of the simplified phane skeleton. However, locants for the atoms of the amplificants must be distinguished from the arabic number locants of the simplified skeleton. Thus, locants for amplificant atoms are constructed by citing the actual locants of the amplificant as superscripts to the locant of the superatom that represents the amplificant in the simplified skeleton.

PhI-3.3.2. In a substituted phane parent hydride name, a series of composite locants based on the same superatom locant must not be contracted. As it is the rule for citing locants in front of detachable prefixes, there must be a number of locants corresponding to the multiplicative prefix, 'di', 'tri', etc., in front of the prefix.

PhI-3.3.3. The seniority of a composite locant is determined first on the basis of its primary locants, i.e., the locants of the phane parent skeleton, and, if these locants are identical, on the basis of the complete composite locant itself, i.e., the primary locant and its superscripts.

Example 18.

1⁴,1⁵,1⁶,3,3,4²,4³-heptacloro-1(1,3),4(1,4)-dibenzenacycloheptaphane

not 1^4,5,6,3,3,4^2,3-heptachloro-1(1,3),4(1,4)-dibenzenacyclohetaphane

(See PhI-3.3.2; superscript locants denoting positions on amplificants are not contracted.)

not 1²,1³,2,2,4⁴,4⁵,4⁶-heptachloro-1(1,4),4(1,3)-dibenzenacycloheptaphane

(See PhI-3.2.2; the amplificant with the lower locant set is not assigned to the superatom with the lower locant.)

Example 19.

1⁴,1⁵,1⁶,4⁴,4⁶-pentachlor-1,4(1,3)-dibenzenacyclohexaphane

not 1⁴,1⁶,4⁴,4⁵,4⁶-pentachlor-1,4(1,3)-dibenzenacyclohexaphane

(See PhI-3.3.3; the primary locant set 1,1,1,4,4 is lower than the locant set 1,1,4,4,4.)

Example 20.

1⁴,1⁵,4⁴,4⁶-tetrachloro-1,4(1,3)-dibnzenacyclohexaphane

not 1⁴,1⁶,4⁴,4⁵-tetrachloro-1,4(1,3)-dibnzenacyclohexaphane

(See PhI-3.3.3; the primary locant sets, 1,1,4,4, are identical but the composite locant set 1⁴,1⁵,4⁴,4⁶ is lower than 1⁴,1⁶,4⁴,4⁵.)

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