Process for pd-catalyzed hydroxycarbonylation of diisobutene: ratio of 3,5,5-trimethylhexanoic acid/h20

A process comprising:

• a) adding diisobutene to form a reaction mixture,
• b) adding a compound comprising Pd, wherein the Pd is capable of forming a complex to the mixture,
• c) adding to the mixture ligand L1:
• d) adding to the mixture 3,5,5-trimethylhexanoic acid and water, wherein the ratio based on the volumes used is in the range from 1.0/1.0 to 1.8/0.2,
• feeding CO into the mixture,
• f) heating the reaction mixture such that the diisobutene is converted to the compound P1: