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

1978-08-30

1980-05-20

Edmundson, F. C.

Chemistry: electrical and wave energy

Processes and products

204 59R, 568591, C25B 302, C07C 4100

Patent

active

042038111

ABSTRACT:
p-Benzoquinone-diketals of the formual I ##STR1## in which R is H, (C.sub.1 -C.sub.4)-alkyl or halogen, and R.sup.1 is (C.sub.1 -C.sub.4)-alkyl, are prepared by anodic oxidation of benzene or an alkoxybenzene of the formulae ##STR2## in which R and R.sup.1 are as defined for formula I, in methanol containing less than about 5% by weight of water, in th presence of at least one alkali metal fluoride, ammonium fluoride and/or phosphonium fluoride as supporting electrolyte the pH being maintained below 7 by addition of HF.
It is especially advantageous to carry out the anodic oxidation in a continuous-flow cell with the use of bipolar electrodes of glass-like carbon wherein the cathode surface is coated with a material reducing the hydrogen overvoltage, preferably titanium carbide.

REFERENCES:
patent: 4046652 (1977-09-01), Pistorius et al.

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