Patent ID: 6297404
Filing Date: 2001-10-02
Classification: B01J,C07C

Abstract:
A process for preparing 3,5,5-trimethylcyclohex-2-ene-1,4-dione by oxidation of 3,5,5-trimethylcyclohex-3-en-1-one with molecular oxygen in the presence of a solvent, of a base and of a catalyst of the formula I ##STR6##whereR.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8are, independently of one another, hydrogen, halogen, NO.sub.2, COR.sup.9, OCOR.sup.9, COOR.sup.9, SO.sub.2 R.sup.9 or SO.sub.3 R.sup.9, whereR.sup.9 is hydrogen or a C.sub.1 -C.sub.4 -alkyl radical,M is Mn(II), Mn(III), Co(II), Co(III).sup.(+) X(-), Fe(II), Fe(III).sup.(+) X(-), Cu(II) or Ru(II), whereX.sup.(-) is a negatively charged counter ion for metals in oxidation state III,which process is carried out in the presence of one or more acetate salts of the general formula II(R.sup.10 R.sup.11 R.sup.12 C--COO.sup.(-).sub.m Y.sup.(m+) (II)as additive, whereR.sup.10, R.sup.11 and R.sup.12 are, independently of one another, hydrogen, F, Cl, Br, I or a C.sub.1 -C.sub.4 -alkyl radical, drawingY is NH.sub.4.sup.+ or a singly to quadruply charged metal cation of the 1st to 4th main group andm is 1, 2, 3 or 4.