632-46-2Relevant academic research and scientific papers
Milled Dry Ice as a C1 Source for the Carboxylation of Aryl Halides
O'Brien, Connor J.,Nicewicz, David A.
supporting information, p. 814 - 816 (2021/03/01)
The use of carbon dioxide as a C1 chemical feedstock remains an active field of research. Here we showcase the use of milled dry ice as a method to promote the availability of CO 2in a reaction solution, permitting practical synthesis of arylcarboxylic acids. Notably, the use of milled dry ice produces marked increases in yields relative to those obtained with gaseous CO 2, as previously reported in the literature.
Magnesiation of Aryl Fluorides Catalyzed by a Rhodium-Aluminum Complex
Fujii, Ikuya,Semba, Kazuhiko,Li, Qiao-Zhi,Sakaki, Shigeyoshi,Nakao, Yoshiaki
supporting information, p. 11647 - 11652 (2020/08/06)
We report the magnesiation of aryl fluorides catalyzed by an Al-Rh heterobimetallic complex. We show that the complex is highly reactive to cleave the C-F bonds across the polarized Al-Rh bond under mild conditions. The reaction allows the use of an easy-to-handle magnesium powder to generate a range of arylmagnesium reagents from aryl fluorides, which are conventionally inert to such metalation compared with other aryl halides.
CO2 (De)Activation in Carboxylation Reactions: A Case Study Using Grignard Reagents and Nucleophilic Bases
Valera Lauridsen, Jerik Mathew,Cho, Sung Yeon,Bae, Han Yong,Lee, Ji-Woong
supporting information, p. 1652 - 1657 (2020/03/30)
Carbon dioxide (CO2) is an intrinsically stable molecule. However, its reactivity toward nucleophilic bases has constituted an appealing characteristic for applications such as CO2 capture and functionalization. To shed light on the role of nucleophilic bases in CO2 functionalization, we performed some mechanistic studies using nitrogen-containing bases as an additive-in catalytic amounts-for carboxylation reactions of Grignard reagents. Our kinetic analysis and in situ infrared spectroscopy revealed the role of nucleophilic bases, particularly that of DBU (1,8-diazabicycloundec-7-ene), in CO2 (de)activation for carboxylation reactions.
Nickel-Catalyzed Ortho C–H Methylation of Aromatic Amides with Di-tert-butyl Peroxide as Methylation Reagent
Liu, Da,Yu, Lin,Yu, Yongqi,Xia, Zhen,Song, Zenan,Liao, Lihong,Tan, Ze,Chen, Xiang
supporting information, p. 6930 - 6934 (2019/11/13)
A new efficient protocol for the ortho-methylation of benzamides with DTBP has been developed via Ni(II)-catalyzed C–H activation directed by 8-aminoquinoline. This method is performed under base-free, ligand-free conditions and utilizes cheap and commercially available reagents. Moreover, the by-product acetone derived from DTBP does not affect the purification of the product.
Method for copper-catalyzed carboxylation reaction of arylboronic acid and carbon dioxide
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Paragraph 0087; 0088, (2019/12/29)
The invention discloses a method for a copper-catalyzed carboxylation reaction of arylboronic acid and carbon dioxide. According to the method, carbon dioxide is used as a C1 source, copper catalysisis adopted, alkoxide serves as alkali, and a reaction is carried out in an organic solvent; the method is simple in process and easy to implement, and shows wide functional group compatibility; the method allows various arylboronic acids such as monosubstituted or polysubstituted phenylboronic acid, polycyclic aromatic hydrocarbon boronic acid and benzoheterocyclic boronic acid to be converted into corresponding arylcarboxylic acids with considerable yield under mild conditions; and the produced carboxylic acids have important application value, and can be used for deriving a great number of other common chemical substances, such as acyl halide, acid anhydride, ester and amide.
Preparation method for o-tolylacetic acid aryl formic acid derivative
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Paragraph 0044-0047, (2019/07/16)
The invention discloses a preparation method for an o-tolylacetic acid aryl formic acid derivative. According to the method, new C-C bonds can be formed, the organic o-tolylacetic acid aryl formic acid derivative is obtained, the good functional group tolerance is achieved, and the o-tolylacetic acid aryl formic acid derivative which cannot be easily obtained by adopting other methods can be synthesized; according to the method, adopted raw materials are easy to obtain, the yield is high, the reaction conditions are mild, the substrate range is wide, and after-treatment is simple and green.
Palladium-Catalyzed ortho-C-H Methylation of Benzoic Acids
Lv, Weiwei,Wen, Si,Liu, Jing,Cheng, Guolin
, p. 9786 - 9791 (2019/08/26)
A palladium-catalyzed methylation of C-H bonds of benzoic acids with di-tert-butyl peroxide as the methylating reagent under an external oxidant and ligand-free conditions has been achieved. The reaction is found to be directed by a weakly coordinating carboxyl group, offering a facile route for the synthesis of highly functionalized ortho-methyl benzoic acids.
Site- and regio-selective incorporation of carbon dioxide into the C(sp2)Si bond of benzosilacyclobutenes
Ishida, Naoki,Okumura, Shintaro,Murakami, Masahiro
supporting information, p. 570 - 572 (2018/04/12)
A reaction of benzosilacyclobutenes with carbon dioxide is catalyzed by a nickel complex having an N-heterocyclic carbene ligand. Carbon dioxide inserts into the C(sp2)Si bond in a site- and regio-selective manner to form a carboncarbon bond, furnishing benzoic acid derivatives.
Room Temperature Carbonylation of (Hetero) Aryl Pentafluorobenzenesulfonates and Triflates using Palladium-Cobalt Bimetallic Catalyst: Dual Role of Cobalt Carbonyl
Joseph, Jayan T.,Sajith, Ayyiliath M.,Ningegowda, Revanna C.,Shashikanth, Sheena
, p. 419 - 425 (2017/02/10)
An efficient method for the carbonylation of (hetero) aryl pentafluorobenzenesulfonates and triflates under exceptionally mild conditions using palladium/dicobalt octacarbonyl [Pd/Co2(CO)8] has been developed. Besides acting as carbon monoxide (CO) source, Co2(CO)8enhances the reaction rate by accelerating the CO insertion through an in situ generated bimetallic palladium cobalt tetracarbonyl [Pd-Co(CO)4] complex. Under the optimized reaction condition, carbonylation of a wide range of activated and deactivated, as well as sterically hindered and heteroaromatic, substrates proceeded efficiently at room temperature. The high chemoselectivity and improved synthesis of biologically relevant Isoguvacine and Lazabemide intermediates highlights its scope as a valuable synthetic method. The generality of this protocol was further extended to other electrophiles (bromides, chlorides and tosylates). (Figure presented.).
Iron-Catalyzed Ortho C-H Methylation of Aromatics Bearing a Simple Carbonyl Group with Methylaluminum and Tridentate Phosphine Ligand
Shang, Rui,Ilies, Laurean,Nakamura, Eiichi
supporting information, p. 10132 - 10135 (2016/08/31)
Iron-catalyzed C-H functionalization of aromatics has attracted widespread attention from chemists in recent years, while the requirement of an elaborate directing group on the substrate has so far hampered the use of simple aromatic carbonyl compounds such as benzoic acid and ketones, much reducing its synthetic utility. We describe here a combination of a mildly reactive methylaluminum reagent and a new tridentate phosphine ligand for metal catalysis, 4-(bis(2-(diphenylphosphanyl)phenyl)phosphanyl)-N,N-dimethylaniline (Me2N-TP), that allows us to convert an ortho C-H bond to a C-CH3 bond in aromatics and heteroaromatics bearing simple carbonyl groups under mild oxidative conditions. The reaction is powerful enough to methylate all four ortho C-H bonds in benzophenone. The reaction tolerates a variety of functional groups, such as boronic ester, halide, sulfide, heterocycles, and enolizable ketones.
