(+)-(3aS,6aS)-3a,6a-Dihydro-2,2-dimethyl-4H-cyclopenta-1,3-dioxol-4-one

for the following products (3aS,6aS)-2,2-dimethyl-2H,3ah,4H,6ah-cyclopenta[d][1,3]dioxol-4-one and (+)-(3aS,6aS)-3a,6a-Dihydro-2,2-dimethyl-4H-cyclopenta-1,3-dioxol-4-one