| abstract |
METHOD OF PREPARING A CATECHOL DIACETATE OF THE FORMULA: 1,2-DI(CH3-COO-),3-R1,4-R2,5-R3-BENZENE WHERE R1, R2, AND R3 ARE HYDROGEN OR ALKYL COMPRISING CONTACTING A HALOCYCLOHEXANONE OF THE FORMULA: 2-X3,2-X4,3-R1,4-R2,5-R3,6-X1,6-X2-CYCLOHEXANONE WHERE R1, R2 AND R3 ARE AS HERETOFORE DEFINED AND X1, X2, X3 AND X4 ARE HYDROGEN OR HALOGEN AT LEAST ONE OF THE X MEMBERS BEING HALOGEN WITH ACETIC ANHYDRIDE IN THE PRESENCE OF A CATALYTIC AMOUNT OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF BORON TRIFLUORIDE ETHERATE, PYRIDINE, CONCENTRATED SULFURIC ACID AND HYDROCHLORIC ACID, SUBSEQUENTLY CONTACTING THE RESULTANT MIXTURE WITH CONCENTRATED SULFURIC ACID. |