A New Chiral Route to Optically Pure (+)- and (-)-cis-endo-4-Oxatricyclo[5.2.1.02,6]dec-8-en-3-one

s: cis-endo-4-Oxatricyclo[5.2.1.0 2 , 6 ]dec-8-en-3-one has been prepared from known chiral hydroxydicyclopentadiene by sequential oxidative cleavage of cis-oriented glycols as the key steps.