| http://www.w3.org/ns/prov#value | - The compounds according to the invention are obtained by reacting 1,8-dihydroxy-9-anthrone (or anthralin) with an unsaturated compound (philodiene), where this compound can be ethylenic or acetylenic, the reaction being carried out in an appropriate organic solvent and in particular in tetrahydrofuran (THF) or acetonitrile, possibly in the presence of a catalyst.
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