Misao Umehara

3-Acetonylbicyclo[6.3.0]undecane-2,6-dione, (I), 7-Acetonyl-4,4-dimethylbicyclo[6.3.0]undecane-2,6-dione, (II), 7,12-Dihydroxy-12-methyltetracyclo[8.2.1.01,5.07,11]tridecan-13-one Monohydrate, (III), and 8,8-Dimethyltricyclo[9.3.0.02,6]tetradec-5-ene-4,10-dione, (IV)

The crystal structures of the four title compounds, C 14 H 20 O 3 , (I), C 16 H 24 O 3 , (II), C 14 H 20 O 3 .H 2 O, (III), and C 16 H 22 O 2 , (IV), which were obtained during studies of the preparation of C 5 -C 8 -C 5 fused-ring compounds, have been determined by X-ray diffraction.

4-Methylbicyclo[6.3.0]undecane-2,6-dione, (I), 7-bromo-4-methylbicyclo[6.3.0]undecane-2,6-dione, (II), 7-acetonyl-4-methylbicyclo[6.3.0]undecane-2,6-dione, (III), and 8-methyltricyclo[9.3.0.02,6]tetradec-5-ene-4,10-dione, (IV)

The crystal structures of the four title compounds, C 12 H 18 O 2 , (I), C 12 H 17 BrO 2 , (II), C 15 H 22 O 3 , (III), and C 15 H 20 O 2 , (IV), which were obtained during studies of the preparation of C 5 -C 8 -C 5 fused-ring compounds, have been determined. The eight-membered rings in all four compounds take the boat-chair form.

Tricyclo[9.3.0.03,7]tetradec‐3‐ene‐5,10‐dione (I), tetracyclo[9.3.0.01,5.05,9]tetradecane‐2,7‐dione (II) and cis‐cisoid‐cis‐2,9‐epoxy‐9‐methyltricyclo[9.3.0.04,8]tetradecan‐2‐ol (III)

The crystal structures of the three title compounds, which were obtained during studies of the preparation and reactions of 5-8-5 fused-ring compounds, have been determined by X-ray diffraction.

Three isomers of tricyclo[10.3.0.04,9]pentadecane-2,10-dione, (I), (II) and (III), and cis-cisoid-cis-9-hydroxy-9-methyltricyclo[9.3.0.03,7]tetradecan-2-one, (IV)

The crystal structures of the four title compounds, which were obtained during studies of the preparation and reactions of 6-8-5 and 5-8-5 fused-ring compounds, have been determined by X-ray diffraction. (I), (II) and (III) are cis-cisoid-cis, trans-cisoid-cis and trans-transoid-cis isomers of the 6-8-5 fused-ring compound, respectively. The eight-membered ring takes a boat-chair form in compounds (I) to (IV)