188
6.7.1.2
Ring Systems
6 Construction of the Names of Complex Compounds
Lithium naphthalen-2-yl-(E)-diazenolate
trad.: Lithium naphthalene-2-anti-diazoate
For bicyclic systems and non-geminally disubstituted monocycles the traditional cis/trans descriptors are used exclusively.
H
CO
H
H
cis-Decahydronaphthalene
(cis- Decalin)
1-Methyl- trans-bicyclo [8.3.1] tetradeca3-trans,7-trans-diene
conj.: a-Bromo-cis-3-chlorocyclobutanepropanoic acid
subst.: 2-Bromo-3-( cis-3-chlorocyclobutyl)
propanoic acid
CIH2C ....... , / \ ". ~. CH2Br trans-1-(Bromomethyl)-2~
(chloromethyl)cyclopentane
H
H
For rings bearing more than two substituents attached to saturated ring
members an extended cis/trans formalism must be applied. Here, the highest ranked suffix-substituent or, if there is none, the most senior prefix -substituent of the lowest numbered doubly substituted ring member serves as
reference group. This reference group is now labelled with a lower case r in
front of the respective locant; subsequently the most senior substituents at
the other ring atoms are referred to the r-substituent by the lower case letters cOs) or t(rans) placed again in front of the corresponding locants. All
rankings here must of course be done on the basis of the CIP sequence
rules (see Section 6.7.2.1).
6.7.1.2
Ring Systems
6 Construction of the Names of Complex Compounds
Lithium naphthalen-2-yl-(E)-diazenolate
trad.: Lithium naphthalene-2-anti-diazoate
For bicyclic systems and non-geminally disubstituted monocycles the traditional cis/trans descriptors are used exclusively.
H
CO
H
H
cis-Decahydronaphthalene
(cis- Decalin)
1-Methyl- trans-bicyclo [8.3.1] tetradeca3-trans,7-trans-diene
conj.: a-Bromo-cis-3-chlorocyclobutanepropanoic acid
subst.: 2-Bromo-3-( cis-3-chlorocyclobutyl)
propanoic acid
CIH2C ....... , / \ ". ~. CH2Br trans-1-(Bromomethyl)-2~
(chloromethyl)cyclopentane
H
H
For rings bearing more than two substituents attached to saturated ring
members an extended cis/trans formalism must be applied. Here, the highest ranked suffix-substituent or, if there is none, the most senior prefix -substituent of the lowest numbered doubly substituted ring member serves as
reference group. This reference group is now labelled with a lower case r in
front of the respective locant; subsequently the most senior substituents at
the other ring atoms are referred to the r-substituent by the lower case letters cOs) or t(rans) placed again in front of the corresponding locants. All
rankings here must of course be done on the basis of the CIP sequence
rules (see Section 6.7.2.1).