Method for the preparation of 2-hydroxybenzanthrone compounds
AssigneeMontedison Fibre S.p.A.
InventorsGiuseppe Ribaldone, Giampiero Borsotti
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Abstract
A process is disclosed for the preparation of 2-hydroxybenzanthrone and substituted derivatives thereof having the general formula: ##STR1## wherein: R.sub.1 = H, OH R.sub.2, r.sub.3 = h, cl, --OH, --OCH.sub.3, ##STR2## characterized in that an anthraquinone-1-diazonium salt is reacted with an olefinic compound of the formula: ##STR3## wherein X = CN or OCOCH.sub.3, in an alcoholic medium of a lower monovalent alcohol and in the presence of a catalytic quantity of cuprous chloride, at a temperature between 20.degree. and 100.degree. C, and that the reaction intermediate thus obtained is reacted successively with alkali in alcoholic solution.
Claims10
A process for the preparation of a compound having the general formula:
- ##STR11## wherein:
- R.sub.1 is selected from the class consisting of H and OH;
- and
- R.sub.2 and R.sub.3 are selected from the class consisting of H, Cl, OH, OCH.sub.3 and ##STR12## characterized in that an anthraquinone-1-diazonium salt is reacted with an olefinic compound of the formula:
- ##STR13## wherein X = CN or OCOCH.sub.3, in an alcoholic medium of a lower monovalent alcohol and in the presence of a catalytic quantity of cuprous chloride, at a temperature between 20.degree. and 100.degree. C., and that the reaction intermediate thus obtained is reacted successively with alkali in alcoholic solution to produce said compound.
Dependencies are inferred from the claim text.