Process for Pd-catalyzed hydroxycarbonylation of diisobutene: ratio of 3,5,5-trimethylhexanoic acid/H

1. 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,

e) feeding CO into the mixture,

f) heating the reaction mixture such that the diisobutene is converted to the compound P1:

2. The process according to claim 1 ,

wherein the compound in process step b) is selected from:

PdCl 2 , PdBr 2 , Pd(acac) 2 , Pd(dba) 2 (dba=dibenzylideneacetone) or PdCl 2 (CH 3 CN) 2 .

3. The process according to claim 1 ,

wherein the process further comprises

g) adding CF 3 SO 3 H.

4. The process according to claim 1 ,

wherein the reaction mixture is heated to a temperature in the range from 80° C. to 160° C. in process step f).

5. The process according to claim 1 ,

wherein the CO is fed in in process step e) such that the reaction proceeds under a CO pressure in the range from 20 bar to 60 bar.

6. The process according to claim 1 ,

wherein the amount of 3,5,5-trimethylhexanoic acid added per 1 mmol of diisobutene is in the range from 0.3 ml to 0.4 ml.