Patent ID: 6242653
Filing Date: 2001-06-05
Classification: C07C

Abstract:
A process for the preparation of carbonyl compounds of the formula I ##STR12##where R.sup.1 and R.sup.2 are a branched or unbranched aliphatic, cycloaliphatic, aromatic-aliphatic and cycloaliphatic-aliphatic radical having from 1 to 10 carbon atoms, orR.sup.1 and R.sup.2 together are an alkylene group having from 3 to 10 carbon atoms which is unsubstituted or substituted by lower alkyl groups,and X is=O or 2 alkoxy groups --OR.sup.3, where R.sup.3 is a saturated or unsaturated, branched or unbranched aliphatic radical having from 1 to 4 carbon atoms, or the two R.sup.3 together are an alkylene group having from 3 to 6 carbon atoms which is unsubstituted or substituted by lower alkyl groups,which comprises oxidizing alcohols of the formula II ##STR13##where R.sup.1 to R.sup.3 and X are as defined above,with oxygen in the gaseous phasea) at temperatures of from 270 to 600.degree. C. on silver coated catalysts which comprise an abrasion-resistant coating of metallic silver on a core of inert support material, orb) at temperatures of from 450 to 750.degree. C. on silver crystals and/or copper crystals having a particle size of from 0.1 to 2.5 mm for a residence time of at most 0.1 second.