527-72-0Relevant articles and documents
LIQUID-PHASE CATALYTIC OXIDATION OF 2-METHOXYMETHYLTHIOPHENE
Leichenko, A. A.,Schedrinskaya, T. V.,Volkov, M. N.
, p. 714 - 718 (1980)
The oxidation of 2-methoxymethylthiophene with molecular oxygen in the presence of a cobalt bromide catalyst in the kinetic region at 65-100 deg C was investigated.It is shown that the principal products are 2-formylthiophene and methylthiophene-2-carboxylate in a ratio of 1:2.The composition of the products does not depend on the oxidation temperature and changes as the starting concentration of 2-methoxymethylthiophene and the amount of cobalt bromide catalyst are changed.
CLEAVAGE DIRECTION OF C-O BOND IN ANION RADICALS OF METHYL ESTERS OF AROMATIC ACIDS IN APROTIC SOLVENTS
Gul'tai, V. P.,Rubinskaya, T. Ya.,Korotaeva, L. M.
, p. 1499 - 1500 (1982)
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Photochemistry of diketones: Observation of a triplet state-oxygen adduct
Cosa, Gonzalo,Scaiano, Juan C.
, p. 8636 - 8637 (2004)
The presence of triplet state-oxygen adducts (a species previously proposed but never observed in a direct manner) is readily observed following laser flash photolysis studies of 2,2′-thenil. We report on the kinetic and spectroscopic parameters characteristic of this transient adduct. Copyright
Palladium-promoted One-step Carboxylation of Aromatic Compounds with Carbon Monoxide
Fujiwara, Yuzo,Kawauchi, Tomio,Taniguchi, Hiroshi
, p. 220 - 221 (1980)
The one-step carboxylation of aromatic compounds such as benzene, toluene, anisole, chlorobenzene, furan, and thiophen has been carried out using carbon monoxide and palladium acetate; the reaction does not require oxygen and is electrophilic.
Gram-scale synthesis of carboxylic acids via catalytic acceptorless dehydrogenative coupling of alcohols and hydroxides at an ultralow Ru loading
Chen, Cheng,Cheng, Hua,Verpoort, Francis,Wang, Zhi-Qin,Wu, Zhe,Yuan, Ye,Zheng, Zhong-Hui
, (2021/12/13)
Acceptorless dehydrogenative coupling (ADC) of alcohols and water/hydroxides is an emergent and graceful approach to produce carboxylic acids. Therefore, it is of high demand to develop active and practical catalysts/catalytic systems for this attractive transformation. Herein, we designed and fabricated a series of cyclometallated N-heterocyclic carbene-Ru (NHC-Ru) complexes via ligand tuning of [Ru-1], the superior complex in our previous work. Gratifyingly, gram-scale synthesis of carboxylic acids was efficiently enabled at an ultralow Ru loading (62.5 ppm) in open air. Moreover, effects of distinct ancillary NHC ligands and other parameters on this catalytic process were thoroughly studied, while further systematic studies were carried out to provide rationales for the activity trend of [Ru-1]-[Ru-7]. Finally, determination of quantitative green metrics illustrated that the present work exhibited superiority over representative literature reports. Hopefully, this study could provide valuable input for researchers who are engaging in metal-catalyzed ADC reactions.
Mechanochemical Grignard Reactions with Gaseous CO2 and Sodium Methyl Carbonate**
Pfennig, Victoria S.,Villella, Romina C.,Nikodemus, Julia,Bolm, Carsten
supporting information, (2022/01/22)
A one-pot, three-step protocol for the preparation of Grignard reagents from organobromides in a ball mill and their subsequent reactions with gaseous carbon dioxide (CO2) or sodium methyl carbonate providing aryl and alkyl carboxylic acids in up to 82 % yield is reported. Noteworthy are the short reaction times and the significantly reduced solvent amounts [2.0 equiv. for liquid assisted grinding (LAG) conditions]. Unexpectedly, aryl bromides with methoxy substituents lead to symmetric ketones as major products.
1,2-Dibutoxyethane-Promoted Oxidative Cleavage of Olefins into Carboxylic Acids Using O2 under Clean Conditions
Ou, Jinhua,Tan, Hong,He, Saiyu,Wang, Wei,Hu, Bonian,Yu, Gang,Liu, Kaijian
, p. 14974 - 14982 (2021/10/25)
Herein, we report the first example of an effective and green approach for the oxidative cleavage of olefins to carboxylic acids using a 1,2-dibutoxyethane/O2 system under clean conditions. This novel oxidation system also has excellent functional-group tolerance and is applicable for large-scale synthesis. The target products were prepared in good to excellent yields by a one-pot sequential transformation without an external initiator, catalyst, and additive.