| abstract |
PROCEDURE FOR THE PREPARATION OF ANTHRAQUINONES OF GENERAL FORMULA I WHERE R 1, R 2, R 3 AND R 4 ARE HYDROGEN, A RADICAL RENT OF C 1 -C 8 OR A RADICAL ALKYLENE OF C 2 -C 8, MAKING REACT 1.4 - NAFTOQUINONA WITH A 1,3 - GENERAL FORMULA II DIEN IN A CYCLE ADDITION STAGE TO OBTAIN THE CORRESPONDING TETRAHYDROANTRAQUINONE, AND THE TETRAHYDROANTRAQUINONE OXIDATES WITH OXYGEN IN THE PRESENCE OF A BASIC CATALYST TO TAKE LA ANTANTA TOTA OF CYCLING AS THE STAGE OF OXIDATION IN THE PRESENCE OF A WATER DILUENT. PREFERIBLY THE CYCLING STAGE AND THE OXIDATION STAGE IS CARRIED OUT AT A REACTION TEMPERATURE BETWEEN 90 AND 110 ° C AND THE ATMOSPHERIC PRESSURE. |