A stable, crystalline diozonide, derived from Hexamethyl(Dewar Benzene
) 1, has been shown by X-ray crystallographic analysis to be the endo,
endoisomer 3c which had been predicted to be less stable than the endo
,exo-isomer 3b. Acidolysis of the trans-ozonide 5 in CF3CO2H/CH2Cl2 ga
ve a stable crystalline tricyclic peroxide 6 whereas the isomeric cis-
ozonide 7 decomposed under similar conditions.