Process for the manufacture of p-benzoquinone- diketals

Details Process for the manufacture of p-benzoquinone- diketals Process for the manufacture of p-benzoquinone- diketals

C - Chemistry, Metallurgy

25

B

204/55

C25B 3/02 (2006.01)

Patent

CA 1111370

PROCESS FOR THE MANUFACTURE OF p-BENZOQUINONE-DIKETALS Abstract of the disclosure: p-Benzoquinone-diketals of the formula I Image (I) in which R is H, (C1-C4)-alkyl or halogen, and R1 is (C1- C4)-alkyl, by anodic oxidation of benzene or an alkoxyben- zene of the formulae Image Image (II) or (III) in which R and R1 are as defined in sub formula I, are prepar- ed in methanol containing less than about 5 % by weight of water, in the presence of at least one alkali metal fluo- ride, ammonium fluoride and/or phosphonium fluoride as supporting electrolyte and a pH maintained below 7 by addition of HF. Especially advantageously, the anodic oxidation is carried out in a continuous-flow cell with the use of bipolar electrodes of glass-like carbon the cathode face of which is coated with a material reducing the hydrogen overvoltage, preferably titanium carbide.

310410

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