6471-66-5Relevant academic research and scientific papers
Visible-light-initiated manganese-catalyzed Giese addition of unactivated alkyl iodides to electron-poor olefins
Dong, Jianyang,Wang, Xiaochen,Wang, Zhen,Song, Hongjian,Liu, Yuxiu,Wang, Qingmin
supporting information, p. 11707 - 11710 (2019/10/02)
Herein, we report a mild protocol for direct visible-light-initiated Giese addition of unactivated alkyl iodides to electron-poor olefins (Michael acceptors) with catalysis by decacarbonyl dimanganese, Mn2(CO)10, an inexpensive earth-abundant-metal catalyst. This protocol is compatible with a wide array of sensitive functional groups and has a broad substrate scope with regard to both the alkyl iodide and the Michael acceptor.
Oxidative Alkane C?H Alkoxycarbonylation
Lu, Lijun,Shi, Renyi,Liu, Luyao,Yan, Jingwen,Lu, Fangling,Lei, Aiwen
supporting information, p. 14484 - 14488 (2016/10/03)
Directly utilizing a chemical feedstock to construct valuable compounds is an attractive prospect in organic synthesis. In particular, the combination of C(sp3)?H activation and oxidative carbonylation involving alkanes and CO gas is a promising and efficient method to synthesize carbonyl derivatives. However, due to the high C?H bond dissociation energy and low polarity of unactivated alkanes, the carbonylation of unactivated C(sp3)?H bonds still remains a great challenge. In this work, we introduce a palladium-catalyzed radical oxidative alkoxycarbonylation of alkanes to prepare numerous alkyl carboxylates. Various alkanes and alcohols were compatible, generating the desired products in up to 94 % yield. Remarkably, ethane, a constituent of natural gas, could be employed as a substrate under the standard reaction conditions. Preliminary mechanistic studies revealed a probable palladium-catalyzed radical process.
The scope and mechanism of palladium-catalysed Markovnikov alkoxycarbonylation of alkenes
Li, Haoquan,Dong, Kaiwu,Jiao, Haijun,Neumann, Helfried,Jackstell, Ralf,Beller, Matthias
, p. 1159 - 1166 (2016/11/28)
Hydroesterification reactions represent a fundamental type of carbonylation reaction and constitute one of the most important industrial applications of homogeneous catalysis. Over the past 70 years, numerous catalyst systems have been developed that allow for highly linear-selective (anti-Markovnikov) reactions and are used in industry to produce linear carboxylates starting from olefins. In contrast, a general catalyst system for Markovnikov-selective alkoxycarbonylation of aliphatic olefins remains unknown. In this paper, we show that a specific palladium catalyst system consisting of PdX2/N-phenylpyrrole phosphine (X, halide) catalyses the alkoxycarbonylation of various alkenes to give the branched esters in high selectivity (branched selectivity up to 91%). The observed (and unexpected) selectivity has been rationalized by density functional theory computation that includes a dispersion correction.
A recyclable CO surrogate in regioselective alkoxycarbonylation of alkenes: Indirect use of carbon dioxide
Gehrtz,Hirschbeck,Fleischer
supporting information, p. 12574 - 12577 (2015/08/06)
Herein, we report a Pd-catalysed alkoxycarbonylation of alkenes based on the use of a recyclable CO2 reduction product, the crystalline and air-stable N-formylsaccharin, as a CO surrogate. The carbonylation proceeds under ambient conditions in an exceptionally complementary regioselective fashion yielding the desired branched products from styrene derivatives and valuable linear esters from alkyl-substituted alkenes.
PROCESS FOR PREPARING ESTERS FROM FORMATES AND OLEFINICALLY UNSATURATED COMPOUNDS
-
Paragraph 0060; 0064, (2014/10/29)
The invention provides a process for preparing esters from formates and olefinically unsaturated compounds with catalysts based on palladium compounds. In addition, the invention discloses a polyphasic reaction mixture and nonyl methyl ester mixtures prepared by the process according to the invention.
Novel ruthenium-catalyst for hydroesterification of olefins with formates
Profir, Irina,Beller, Matthias,Fleischer, Ivana
supporting information, p. 6972 - 6976 (2014/10/15)
An alternative ruthenium-based catalyst for the hydroesterification of olefins with formates is reported. The good activity of our system is ensured by the use of a bidentate P,N-ligand and ruthenium dodecacarbonyl. A range of formates can be used for selective alkoxycarbonylation of aromatic olefins. In addition, the synthesis of selected aliphatic esters is realized. The proposed active ruthenium complex has been isolated and characterized. This journal is the Partner Organisations 2014.
A unique palladium catalyst for efficient and selective alkoxycarbonylation of olefins with formates
Fleischer, Ivana,Jennerjahn, Reiko,Cozzula, Daniela,Jackstell, Ralf,Franke, Robert,Beller, Matthias
, p. 417 - 420 (2013/04/24)
Forget about CO! Carbonylations are among the most important homogeneously catalyzed reactions in the chemical industry, but typically require carbon monoxide. Instead, straightforward and efficient alkoxycarbonylations of olefins can proceed with alkyl formates in the presence of a specific palladium catalyst. Aromatic, terminal aliphatic, and internal olefins are carbonylated to give industrially important linear esters at low catalyst loadings. Copyright
Enzymatic esterification in aqueous miniemulsions
Aschenbrenner, Eugen M.,Weiss, Clemens K.,Landfester, Katharina
experimental part, p. 2434 - 2444 (2009/12/08)
Monoesters of various linear carboxylic acids (C7-C12) with ω-phenyl-labeled primary alcohols (C1-C5) were synthesized in aqueous miniemulsions with various lipases as biocatalysts. The reactants were dispersed in an aqueous solution of a nonionic surfact
A Convenient Protocol for the Esterification of Carboxylic Acids with Alcohols in the Presence of di-t-Butyl Dicarbonate
Goo?en, Lukas J.,D?hring, Arno
, p. 263 - 266 (2007/10/03)
Stoichiometric mixtures of carboxylic acids and primary or secondary alkyl alcohols are cleanly converted into their corresponding esters by treatment with di-t-butyl dicarbonate [(BOC)2O] in the presence of catalytic amounts of N,N′-dimethylaminopyridine (DMAP). This convenient procedure provides a general access to a broad variety of esters including those bearing highly sensitive functional groups such as phenol esters or BOC-groups. Purification of the products is particularly easy since the byproducts t-BuOH and CO2 are volatile - a great advantage over the standard DCC/DMAP method.
Process for the preparation of carboxylic benzyl esters
-
, (2008/06/13)
Carboxylic benzyl esters can be prepared by reacting benzyl chloride with carboxylic acids in the presence of one or more quaternary ammonium carboxylates as catalyst.
