| http://www.w3.org/ns/prov#value | - ctahydro-5,8-epoxy-1H-benzopyran-3-ol or (exo)octahydro-4,7-epoxyisobenzofuran-1-ol (prepared as described in U.S. Pat. No. 4,143,054) of the structure C ##STR82## employing a molar ratio of C:B2 of within the range of from about 1:2 to about 1:4, in the presence of an inert organic solvent such as THF at a reduced temperature of from about -78??? to about 25??? C., to form the condensed 7-oxabicy
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