Isobenzan

The precursor 4,5,6,7,10,10-hexachloro-4,7-endomethylene-4,7,8,9-tetrahydrophthalane can be obtained in two synthetic routes. In a synthesis method report published in 1954, 1,4,5,6,7,7-hexachloro-2,3-bishydroxymethylbicyclo[2,2,1]hept-5-ene is obtained, which is then dehydrated to the precursor. In 1961, a direct preparation of the precursor via a Diels-Alder reaction with hexachlorocyclopentadiene and 2,5-Dihydrofuran was found. The target compound is then synthesized by photochlorination of the precursor. ==References==