36781-66-5Relevant articles and documents
Reactions of π-allylic complexes of palladium with methyl formate
Keim,Becker,Kraneburg,Greven
, p. 37 - 43 (1989)
The reaction of methyl formate with various π-allylic palladium complexes is reported. Unsaturated carboxylic acid esters are formed in high yield and selectivity. A comparison of the reactivity of methyl formate with that of the hydroesterification subst
Palladium-Catalyzed Methoxycarbonylation of 1,3-Butadiene to Methyl-3-Pentenoate: Introduction of a Continuous Process
Han, Li-Jun,Ma, Shuang-Shuang,Rao, Chong-Shun,Sheng, Gui-Yang,Xu, Bao-Hua,Zhang, Jun-Ping
, p. 283 - 290 (2021/10/27)
The base-assisted Pd(cod)Cl2/Xantphos-catalyzed methoxycarbonylation of 1,3-butadiene (BD) to methyl-3-pentenoate (MP) was explored. Mechanistic studies suggest the excessive Xantphos (beyond an equimolar amount per Pd) as well as its substitute, pyridines of proper steric and electronic functionality, do participate the catalytic cycle and significantly reduce the activation energy by accelerating the rate-limiting methanolysis step. As thus, all the reaction parameters, especially the solvents, were optimized based on the Pd(cod)Cl2/Xantphos/4-hexylpyridine catalytic system, enabling the construction of a continuous process. Systematic optimization demonstrates that a yield of 82% of MP with a purity of 99.8% could be reached under steady-state operation.
Method for enhancing long-chain olefin hydrogen esterification reaction by ionic liquid
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Paragraph 0039-0064, (2021/06/13)
The invention relates to a method for preparing carboxylic ester through long-chain olefin hydrogen esterification reaction. The method is characterized by comprising the following steps: mixing long-chain olefin of which the C number is greater than or equal to 4 with a catalyst, a carbonyl source and alkyl alcohol according to a certain ratio, and carrying out hydrogen esterification reaction in a high-boiling-point solvent such as ester, ketone, ether, amide, aromatic hydrocarbon, sulfone (sulfoxide) or conventional ionic liquid. The first ligand is a bidentate phosphine ligand, and the second ligand is an ionic liquid containing a single-coordination central atom (N, P). The method has the advantages that raw material gas and liquid phases can be in full contact, the catalyst and a high-boiling-point solvent system can be recycled, and rapid separation of the catalyst and a product is achieved. In the conjugated olefin hydrogen esterification reaction, the olefin conversion rate is more than 80%, and the product selectivity is more than 85%; in the monoolefine hydrogen esterification reaction, the olefin conversion rate is greater than 90%, and the product selectivity is greater than 95%.
