Process for Pd-catalyzed hydroxycarbonylation of diisobutene: ligand/Pd ratio

A process for hydrocarbonylation of diisobutene to the corresponding carboxylic acid P1 comprising the process steps of:

• a) adding diisobutene, forming a reaction mixture,
• b) adding a compound comprising Pd, wherein the Pd is capable of forming a complex,
• c) adding ligand L1:
• wherein the ligand L1 is added in an amount in the range from 1.25 mol to 2.0 mol of ligand per mole of Pd,
• d) adding acetic acid,
• e) feeding in CO,
• f) heating the reaction mixture such that the diisobutene is converted to the compound P1: