204
7 Appendix
Table 22 (continued)
Ring contraction too is indicated by the syllable nor while ring expansion is expressed
with the prefix homo. In both cases the designator of the ring in question is placed in
front of the so defind ring modifiers. The original numbering is maintained, but for a nor
derivative the highest locant of the modified ring disappears while for the homo product
the highest locant is supplemented by lower case letters a, b ... etc.
Me
17
16
A -Nor-Sa-androstane
D-Homo-Sa-androstane
Me
Me
D-Dihomo-Sa-androstane
A -Homo-B-nor-Sa-androstane
Heterocyclic steroid analogues are treated according to the rules of replacement nomenclature (see p. SI).
o
1713-Hydroxy-4-oxa-S-androsten-3-one
7 Appendix
Table 22 (continued)
Ring contraction too is indicated by the syllable nor while ring expansion is expressed
with the prefix homo. In both cases the designator of the ring in question is placed in
front of the so defind ring modifiers. The original numbering is maintained, but for a nor
derivative the highest locant of the modified ring disappears while for the homo product
the highest locant is supplemented by lower case letters a, b ... etc.
Me
17
16
A -Nor-Sa-androstane
D-Homo-Sa-androstane
Me
Me
D-Dihomo-Sa-androstane
A -Homo-B-nor-Sa-androstane
Heterocyclic steroid analogues are treated according to the rules of replacement nomenclature (see p. SI).
o
1713-Hydroxy-4-oxa-S-androsten-3-one