Carbon-chain tethered bistetraoxa-cage compounds 7a-c and 8a-c were sy
nthesized from 2-methyl-furan in a four-step sequence. They were obtai
ned from ozonolysis of the syn bisadducts 5a-c and the anti bisadducts
6a-c in dichloromethane at -78 degrees C followed by reduction with d
imethyl sulfide. The structure of the anti bisadduct 6a was proven by
X-ray crystallographical analysis.