KR940000417A - Method for preparing alkanedic acid derivatives - Google Patents

Abstract

The present invention relates to alkanediic acid derivatives such as alkanedi by the reaction of carbon monoxide and hydroxyl group-containing compounds such as C ₁ -C ₆ alkanols with aliphatic conjugated dienes such as butanediene in the presence of a catalyst system consisting of a) -d) Methods for preparing acid diesters: a) a cationic palladium source, b) a first bidentate diphosphine ligand with an electron withdrawing substituent on the valence, c) a second bidentate diphosphine with a substituent which releases the electron on the valence Ligands, and d) anion sources.

Description

Method for preparing alkanedic acid derivatives

Since this is an open matter, no full text was included.

Claims (9)

A process for preparing an alkanediic acid derivative by reaction of an aliphatic conjugated diene with a carbon monoxide and hydroxyl group-containing compound in the presence of a palladium catalyst, wherein the catalyst system consists of a) -d): a) a cationic palladium source, b) A first bidentate diphosphine ligand having an electron withdrawing substituent on the valence, C) a second bidenate diphosphine ligand with a substituent leaving electrons on the valence, and d) an anion source. The method of claim 1, wherein the first bidentate diphosphine ligand contains an aromatic substituent. The method of claim 1, wherein the first bidentate diphosphine ligand is diphosphine of the general formula: R ¹ R ¹ > PRR <R ³ R ⁴ (I) Wherein R ¹ , R ² , R ³ and R ⁴ independently represent an optionally substituted aryl group, and R represents a bridging group having at least two carbon atoms in the bridge. The method of claim 1, wherein the second bidentate diphosphine ligand contains an aliphatic substituent The method of claim 4, wherein the second bidentate diphosphine ligand is diphosphine of the general formula: R ⁵ R ⁶ > PRR <R ⁷ R ⁸ (II) Wherein R ⁵ , R ⁶ , R ⁷ and R ⁸ independently represent an optionally substituted aryl group, and R represents a bridging group having at least two carbon atoms in the bridge. The method of claim ⁵ , wherein R ⁵ , R ⁶ , R ⁷ and R ⁸ are independently selected from alkyl, alkylene, cycloalkyl and cycloalkylene groups. The method of any one of claims 1-6. The aliphatic conjugated diene is 1,3-butadiene. 8. The method of claim 1, wherein the hydroxyl group-containing compound is an alkanol having 1 to 6 carbon atoms. The method of claim 1, wherein the first bidentate diphosphine ligand is used in molar excess relative to the second bidentate diphosphine ligand. ※ Note: The disclosure is based on the initial application.