(3a'R,6a'S)-5,5-dimethyltetrahydro-1'H-spiro[1,3-dioxane-2,2'-pentalen]-5'(3'H)-one

(-)-(3'aS-cis)-N-[3',3'a,4',6'a-tetrahydro-5,5-dimethylspiro[1,3-dioxane-2,2'(1'H)-pentalen-5'-yl]]-N'-(p-toluenesulfonyl)diazene

(+)-(3'aS-cis)-trimethyl[(3',3'a,4',6'a-tetrahydro-5,5-dimethylspiro[1,3-dioxane-2,2'(1H)-pentalen]-5'-yl)oxy]silane

(-)-(3'aS,4'R,6'aR)-[4'-chloro-1',6'a,6',3'a-tetrahydro-5,5-dimethylspiro[1,3-dioxane-2,2'(1'H)-pentalen]]-5'-one

5-lithio-2-pentanone 2',2'-dimethylpropylene ketal