	US 11,925,926 B2
	Platinum complexes having ferrocene diphosphine ligands for catalysis of the hydroxycarbonylation of ethylenically unsaturated compounds
Carolin Schneider, Monheim am Rhein (DE); Ralf Jackstell, Rostock (DE); Matthias Beller, Ostseebad Nienhagen (DE); and Robert Franke, Marl (DE)
Assigned to EVONIK OXENO GMBH & CO. KG, Marl (DE)
Filed by EVONIK OPERATIONS GMBH, Essen (DE)
Filed on Dec. 7, 2021, as Appl. No. 17/544,144.
Claims priority of application No. 20212752 (EP), filed on Dec. 9, 2020.
Prior Publication US 2022/0176360 A1, Jun. 9, 2022
Int. Cl. C07C 51/06 (2006.01); B01J 31/16 (2006.01); C07C 51/00 (2006.01)

CPC B01J 31/1616 (2013.01) [C07C 51/00 (2013.01); C07C 2531/22 (2013.01)]

9 Claims

1. A process comprising:

a) adding an ethylenically unsaturated compound to form a reaction mixture;

b) adding to the reaction mixture a platinum complex having a ferrocene-diphosphine ligand of formula (I)

where

R¹, R², R, and R⁴are each independently selected from —(C₁-C₁₂)-alkyl, —(C₆-C₂₀)— or heteroaryl or

adding to the reaction mixture the ligand of formula (I) and a Pt compound;

c) adding to the reaction mixture an acid;

d) feeding into the reaction mixture CO;

e) heating the reaction mixture formed from a) to d), to convert the ethylenically unsaturated compound to a carboxylic acid.