1.2 Cyclic Systems
TabIe3 (continued)
Morpholine
(Morpholin-2-yl)C
Phosphindoline
a 1-Piperidyl = Piperidino
b German: Chinuclidin
C 4-Morpholinyl = Morpholino
51
component names for more complex fused heterocycles is provided by
Tables 2 and 3. As a rule, the names of the pertinent substituent groups are
formed by sufftxing the syllable .•. yl to the name of the heterocycle.
Exceptions are marked separately. Numbering generally follows that of
related hydrocarbons; if afterwards there is still a choice, hetero atoms are
given lowest locants possible. Contrary to the practice for fused hydrocarbons, hetero atoms at fusion positions (that is, belonging to two ore
more rings) are also numbered sequentially (and not with a, b, c, etc.). For
further details see p. 61.
Use of the trivial names of Table 3 is recommended only for the componds themselves and for the formation of spiro names but not for the construction of fusion names.
Monocyclic hetero systems not having a retained trivial name can basically be named in two different ways. It should be kept in mind, however,
that the principles according to which indexing and abstracting organisations opt for one or the other possibility are sometimes anything but
obvious.
1.2.2.2
Replacement Nomenclature ("0" Nomenclature)
The simplest method for naming heterocyclic compounds is offered by
replacement nomenclature, also known as "a" nomenclature. Accordingly,
the name for the underlying hydrocarbon is supplemented by"a"-term
prefixes which identify the hetero atoms present. The following Table 4
lists, in descending order of priority, "a" terms for the hetero atoms
TabIe3 (continued)
Morpholine
(Morpholin-2-yl)C
Phosphindoline
a 1-Piperidyl = Piperidino
b German: Chinuclidin
C 4-Morpholinyl = Morpholino
51
component names for more complex fused heterocycles is provided by
Tables 2 and 3. As a rule, the names of the pertinent substituent groups are
formed by sufftxing the syllable .•. yl to the name of the heterocycle.
Exceptions are marked separately. Numbering generally follows that of
related hydrocarbons; if afterwards there is still a choice, hetero atoms are
given lowest locants possible. Contrary to the practice for fused hydrocarbons, hetero atoms at fusion positions (that is, belonging to two ore
more rings) are also numbered sequentially (and not with a, b, c, etc.). For
further details see p. 61.
Use of the trivial names of Table 3 is recommended only for the componds themselves and for the formation of spiro names but not for the construction of fusion names.
Monocyclic hetero systems not having a retained trivial name can basically be named in two different ways. It should be kept in mind, however,
that the principles according to which indexing and abstracting organisations opt for one or the other possibility are sometimes anything but
obvious.
1.2.2.2
Replacement Nomenclature ("0" Nomenclature)
The simplest method for naming heterocyclic compounds is offered by
replacement nomenclature, also known as "a" nomenclature. Accordingly,
the name for the underlying hydrocarbon is supplemented by"a"-term
prefixes which identify the hetero atoms present. The following Table 4
lists, in descending order of priority, "a" terms for the hetero atoms