66
5
1 Parent Structures
3b,7a-(Methanoxymethano )-1Hcyclopenta [1] phenanthrene
Beilstein: ... [2]Oxapropano ...
Chern. Abstr.:
methanoxymetheno)-SHdibenzo[ a,d] cycloheptene
For the above complex bridge Beilstein uses a totally systematic replacement name such as [1,3]dioxabutane-1,4,4-triyl; according to a recent
IUPAC recommendation this would be: epoxymethanoxymethanetriyl.
11
12
4a
4
5
4a,S-Dihydro-11 a,S-( epithiomethano )-lOH-naphthacene
(new: ... tetracene)
Beilstein: ... (thiaethano) ...
10,11-Dihydro-1 0,5-(iminomethano )-5H-benzo[ 4,5]cyclohepta[1,2-f] [1,3]benzodioxole
Beilstein: ... (azaethano) ...