2,2 Nomenclature Types for Substituted Systems
93
which two types exist: those linked directly by single or double bonds and
those which are substitutively connected through a bi- or polyvalent
group,
2.2.6.1
Components with Direct Linkage
Here, first of all, the underlying unsubstituted parent components are
joined together as described earlier (p, 38,64), To take account of the substituents, in a second step these assemblies are subjected to the rules of substitutive nomenclature just like normal parent structures (lowest possible
locants for positions of attachment!),
2,3' -Bipyridine- } 5' 6 d' Ie'
'd
2 3 ' B'
'd 1
' - ISU 10IC aCl
or: , - Ipyn yCI
CI
OH
HO
3' ,5-Dichloro-4" -( dimethylamino )-1,1': 4',1" -ternaphthalene-2,2' ,8,8'tetrol
The original numbering is, however, preserved when trivial names can be
used for substituted partial components,
1
-f"N\H/N~
HDOC
~ __ \ • 6~/ __ ,~' COOH
NC
CN
4,4'-Dicyano-6,6' -binicotinic
acid
Formerly this naming procedure was occasionally also used for systems
assembled from identical acyclic subunits.
H3C-CO-CO-CH3
Biacetyl
HOOC-NH-NH-COOH C6HsCHrCH1C6Hs
Bicarbamic acid
Bibenzyl