343-01-1Relevant articles and documents
Nanostructured Manganese Oxides within a Ring-Shaped Polyoxometalate Exhibiting Unusual Oxidation Catalysis
Sato, Kai,Yonesato, Kentaro,Yatabe, Takafumi,Yamaguchi, Kazuya,Suzuki, Kosuke
supporting information, (2021/12/30)
Nanosized manganese oxides have recently received considerable attention for their synthesis, structures, and potential applications. Although various synthetic methods have been developed, precise synthesis of novel nanostructured manganese oxides are st
Selective Electrochemical Oxygenation of Alkylarenes to Carbonyls
Li, Xue,Bai, Fang,Liu, Chaogan,Ma, Xiaowei,Gu, Chengzhi,Dai, Bin
supporting information, p. 7445 - 7449 (2021/10/02)
An efficient electrochemical method for benzylic C(sp3)-H bond oxidation has been developed. A variety of methylarenes, methylheteroarenes, and benzylic (hetero)methylenes could be converted into the desired aryl aldehydes and aryl ketones in moderate to excellent yields in an undivided cell, using O2 as the oxygen source and lutidinium perchlorate as an electrolyte. On the basis of cyclic voltammetry studies, 18O labeling experiments, and radical trapping experiments, a possible single-electron transfer mechanism has been proposed for the electrooxidation reaction.
Palladium-catalyzed intramolecular aromatic C-H acylation of 2-arylbenzoyl fluorides
Hayakawa, Kazuki,Ikai, Kana,Ogiwara, Yohei,Sakai, Norio,Sakurai, Yuka
, p. 1882 - 1893 (2021/08/13)
The catalytic intramolecular cyclization of acyl fluorides using a Pd(OAc)2/PCy3 system is described. A wide range of 2-arylbenzoyl fluoride derivatives can be used as fluorenone precursors and the reaction proceeds via an intramolecular coupling between aromatic C-H bonds with acyl C-F bonds. The reaction can be applied to the synthesis of indenofluorenedione derivatives and to the construction of other molecules with fivemembered rings.
N-Hydroxyphthalimide-Mediated Electrochemical Denitrogenation of Aroylhydrazides to Generate Acyl Radicals and Their Applications in the Syntheses of Fluorenones
Zhang, Haonan,Wang, Ting,Xu, Kun,Zeng, Chengchu
, p. 16171 - 16176 (2021/10/12)
N-Hydroxyphthalimide (NHPI)-mediated electrochemical denitrogenation of aroylhydrazides is developed for the first time. The in situ generated acyl radicals could be intramolecularly trapped to give fluorenones with high efficiencies. This electrochemical
Pd-Catalyzed Assembly of Fluoren-9-ones by Merging of C-H Activation and Difluorocarbene Transfer
Liu, Xiaobing,Sheng, Heyun,Zhou, Yao,Song, Qiuling
supporting information, p. 2543 - 2547 (2021/05/05)
We disclose a novel Pd-catalyzed assembly of fluoren-9-ones by merging of C-H activation and difluorocarbene transfer. ClCF2COONa served as a difluorocarbene precursor to be harnessed as a carbonyl source in this transformation. The current protocol enables us to afford fluoren-9-ones in high yields with excellent functional group compatibility, which also represents the first example of using difluorocarbene as a coupling partner in transition-metal-catalyzed C-H activation.
Direct deoxygenative intramolecular acylation of biarylcarboxylic acids
Li, Yantao,Xu, Wentao,Zhu, Chengjian,Xie, Jin
supporting information, p. 387 - 390 (2020/09/11)
A photocatalyzed intramolecular cyclization is developed for the synthesis of fluorenones. In this photoredox reaction, triphenylphosphine is used as an inexpensive and effective deoxygenative reagent for biarylcarboxylic acids to give acyl radicals, which quickly undergo intramolecular radical cyclization. Reactions in the presence of air and continuous flow photoredox technology demonstrate the generality and practicality of this process.
Rapid Formation of Fluoren-9-ones via Palladium-Catalyzed External Carbon Monoxide-Free Carbonylation
Konishi, Hideyuki,Futamata, Suguru,Wang, Xi,Manabe, Kei
, p. 1805 - 1809 (2018/04/02)
A Pd-catalyzed carbonylation reaction for the synthesis of fluoren-9-ones from 2-halogenated biphenyls using phenyl formate as a carbon monoxide surrogate was achieved. The combined use of cesium carbonate and o-anisic acid resulted in a remarkable rate e
Palladium-catalyzed synthesis of fluoreones from bis(2-bromophenyl)methanols
Gao, Qian,Xu, Senmiao
, p. 208 - 212 (2018/01/12)
A palladium-catalyzed synthesis method of fluorenones has been developed. A variety of bis(2-bromophenyl)methanols could undergo the reaction smoothly in the presence of Pd(OAc)2, affording a series of fluorenones in moderate to good yields (two steps). Mechanistic studies reveal that the reaction might be triggered by oxidation of alcohol followed by intramolecular reductive coupling.
CBr4 promoted intramolecular aerobic oxidative dehydrogenative arylation of aldehydes: application in the synthesis of xanthones and fluorenones
Tang, Jing,Zhao, Shijun,Wei, Yuanyuan,Quan, Zhengjun,Huo, Congde
supporting information, p. 1589 - 1592 (2017/02/23)
A simple and practical carbon tetrabromide promoted intramolecular aerobic oxidative dehydrogenative coupling reaction has been developed to provide a straightforward ring closure protocol for 2-aryloxybenzaldehydes to furnish xanthones. The reaction was performed under metal-, additive- and solvent-free conditions with good tolerance of functional groups. The present method is also applicable to the synthesis of fluorenones by using 2-arylbenzaldehydes as substrates. Preliminary studies of the reaction mechanism indicated that the reaction may proceed through a radical pathway.
Palladium-catalyzed cyclocarbonylation of cyclic diaryliodoniums: Synthesis of fluorenones
Liu, Li,Qiang, Jian,Bai, Shuhua,Li, Yang,Miao, Chunbao,Li, Jian
, (2017/09/30)
An efficient approach to the synthesis of fluorenones via the palladium-catalyzed cyclocarbonylation of cyclic diaryliodoniums was developed. Our route enables facile access to fluorenones with various substituents in modest to high yields.
