Process for pd-catalyzed hydroxycarbonylation of diisobutene: sulfuric acid/ligand ratio

Process comprising the process steps of:

• a) addition of diisobutene,
• b) addition of a compound comprising Pd, wherein the Pd is capable of forming a complex,
• c) addition of the ligand L1:
• d) addition of acetic acid,
• e) addition of sulfuric acid, wherein the sulfuric acid is added in an amount which is at least 3.5 mol of sulfuric acid per mole of ligand L1,
• f) feeding in CO,
• g) heating the reaction mixture such that the diisobutene is converted to the compound P1: