Page 112 - Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005)

IR-6.3 S U B S T I T U T I V E N O M E N C L A T U R E

16.
1 2 3 4 5
ClSiH SiHClSiH SiH SiH Cl 1,2,5-trichloropentasilane (not 1,4,5-)
2
2
2
2
17.
1 2 3
BrSnH 2 SnCl 2 SnH 2 C 3 H 7 1-bromo-2,2-dichloro-3-propyltristannane
(bromo preferred to propyl for lowest
locant)
18.
1 2 3 4 5 6 7
HSnCl OSn H OSn H OSn H 2 Cl 1,1,7-trichlorotetrastannoxane
2
2
2
19. H
N
2 1 4
Me 2 Si SiHEt
3
N
H
4-ethyl-2,2-dimethylcyclodisilazane
H–W name: 4-ethyl-2,2-dimethyl-1,3,2,4-diazadisiletane
(locant set 2,2,4 preferred to 2,4,4 in both names)
1,1,1,2,2,2-hexaethyldiplumbane,
20. Et 3 PbPbEt 3
or hexaethyldiplumbane (substitutive),
or bis(triethyllead)(Pb—Pb) ( additive)
21. MeNHN¼NMe 1,3-dimethyltriaz-1-ene

The names of branched structures a re based on the longest available unbranched chain,
which is regarded as defining the parent hydride, and the names of the shorter chains, which
are treated as substituents and appropriately cited. Once t he longest chain has b een chosen, it
is numbered s o a s t o g ive the lowest set of locants to the substituents.

Examples:

22. H B
2
B BH 2
H 2 B

2-boranyltriborane(5)

23. 1 2 5 6 7
H 3 SiSiH 2 SiH 2 SiH 2 SiH 3
3 4
HSi SiH
H 3 Si SiH 2 SiH 3

4-disilanyl-3-silylheptasilane
(not 4-disilanyl-5-silylheptasilane)

If a c hoice of principal chain cannot be made o n t he basis of chain length alone, unsaturation
is the next selection criterion and then the greatest number of substituents.

103