Preparation of saturated esters by oxidation of aldehydes with a palladium salt, a redox system and molecular oxygen in alcoholic medium
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1. A PROCESS FOR CONVERTING AN ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF SATURATED ALIPHATIC AND AROMATIC ALDEHYDES TO AN ESTER OF THE CARBOXYLIC ACID CORRESPONDING TO THE SAID ALDEHYDE WHICH COMPRISES CONTACTING THE ALDEHYDE IN THE LIQUID PHASE WITH A SATURATED UNSUBSTITUTED ALIPHATIC ALCOHOL CONTAINING UP TO TEN CARBON ATOMS IN THE PRESENCE OF A PALLADIUM SALT AND AN INORGANIC REDOX SYSTEM AT A PRESSURE IN THE RANGE FROM ATMOSPHERIC TO 50 ATMOSPHERESS, INCLUSIVE, SAID REDOX SYSTEM BEING REGENERATED BY MEANS OF MOLECULAR OXYGEN.
10. A PROCESS FOR CONVERTING A METHOXY-ALDEHYDE SELECTED FROM THE GROUP CONSISTING OF BETA-METHOXY-PROPIONALDEHYDE AND BETA-METHOXY-ISOBUTYR-ALDEHYDE TO THE METHYL ESTER OF THE CARBOXYLIC ACID CORRESPONDING TO SAID ALDEHYDE, WHICH COMPRISES CONTACTING SAID METHOXY-ALDEHYDE IN THE LIQUID PHASE WITH METHANOL, IN THE PRESENCE OF PALLADOUS CHLORIDE, LITHIUM CHLORIDE, LITHIUM ACETATE AND A REDOX SYSTEM SELECTED FROM THE GROUP CONSISTING OF CUPRIC CHLORIDE AND CUPRIC ACETATE, AT A PRESSURE IN THE RANGE FROM ATMOSPHERIC TO 50 ATMOSPHERES INCLUSIVE, THE WATER CONCENTRATION NOT EXCEEDING 5% BY WEIGHT, THE TOTAL CHLORIDE ION CONCENTRATION BEING IN THE RANGE OF 0.05 TO 0.5 MOLAR AND THE LITHIUM ACETATE CONCENTRATION BEING UP TO TWO MOLAR, SAID REDOX SYSTEM BEING REGENERATED BY MEANS OF MOLECULAR OXYGEN AND SAID METHOXY-ALDEHYDE BEING FORMED IN SITU BY INTRODUCING AN ALPHA-BETA UNSATURATED ALDEHYDE CORRESPONDING TO THE METHOXY-ALDEHYDE INTO THE REACTION MEDIUM.
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