Page 98 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

IR-6.2 S U B S T I T U T I V E N O M E N C L A T U R E

Note that in Example 4 t he numbering for the H–W name differs from that for the other two
methods; H –W priorities depend on the H-atom p osition, and those in (ii) and (iii) on the
locations of the double b onds.

IR-6.2.2.5 Homonuclear polycyclic p arent hydrides

Parent n ames of homonuclear polycycles may be constructed by three methods:

(i) by specifying the fusion of relevant m onocycles (see Section P-25.3 of Ref. 1), each
named by the Hantzsch–Widman system (see Section IR-6.2.4.3);
(ii) by using a s keletal replacement prefix (‘a’ term) from Table X t ogether with the
appropriate multiplicative prefix to indicate replacement o f t he carbon atoms in the
corresponding carbocyclic compound;
(iii) by specifying the ring structure using the von Baeyer notation (see Section P-23.4 of
Ref. 1) in combination with the name of the corresponding linear hydride as derived in
Section IR-6.2.2.1.

Examples:

1. H H
Si Si
HSi 8 Si 1 SiH
7 8a 2
HSi 6 5 Si 4a 4 3 SiH
Si Si
H H

(i) hexasilinohexasiline
(ii) decasilanaphthalene

2. H 2 H 2
Si Si
10 H 2
H 2 Si 9 Si 3 SiH 2
1
H 2 Si 8 7 SiH 5 4 SiH 2
Si 6 Si
H 2 H 2

(ii) and (iii) decasilabicyclo[4.4.0]decane
(iii) bicyclo[4.4.0]decasilane

IR-6.2.3 Boron hydrides

IR-6.2.3.1 Stoichiometric names
Neutral polyboron hydrides are called boranes and the simplest possible p arent structure,
BH 3 , i s g iven t he name ‘ borane’. T he number of boron atoms in a b oron hydride molecule is
indicated by a m ultiplicative prefix. The principal difference between t his s ystem of naming

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