Octahydroanthraquinones and tetrahydronaphthoquinones - prepn - from quinhydrone and dienes in diels-alder reaction

摘要

Process for prepg. octahydroanthraquinones (I) where R1-3 (opt. same) are H, aliphatic, aryl, CN, COOH, OAlkyl, COOAlkyl, aliphatic acyloxy or halogen, R4 (opt. same) are H or aliphatic, both R1 and/or both R3 can together be -O-, -CH2- or -CH2CH2-; two adjacent R2 can together complete an alicyclic ring) by reacting a diene (II) X=R1 at 50-200 degrees with quinhydrone to give a tetrahydronaphthoquinone (III) and reacting this with (II) (x=R3) (I) and (III) are inters. for dyes, pesticides. Pref. (III) is not isolated and one diene is used.