Molecular structure and spectroscopic properties of [Co(Me2dtc)2{(Ph2PO)2BF2}] (Me2dtc =N,N-dimethyldithiocarbamate)
摘要:
Oxidation of a blue ethanolic mixture containing Co(BF4)(2)center dot 6H(2)O and PClPh2 by tetramethylthiuram disulfide afforded a red- colored complex having a cis-[Co-III(Me(2)dtc)(2)(P)(2)] environment (Me(2)dtc = N, N-dimethyldithiocarbamate), although the yield was relatively low. Single- crystal X- ray crystallography revealed that the product was [Co(Me(2)dtc)(2){(Ph2PO)(2)BF2}] (1), where bis(diphenylphosphinito) difluoroborate was probably formed by hydrolysis of PClPh2 followed by reaction with BF4 in ethanol. The same complex was also prepared by hydrolysis of cis-[Co(Me(2)dtc)(2)(PHPh2)(2)]BF4 in a mixture of acetonitrile, methanol and water. The molecular structure and spectroscopic properties of complex 1 were compared with those of the corresponding Ph2POMe complex, cis-[Co(Me(2)dtc)(2)(Ph2POMe)(2)]BF4. (C) 2013 Elsevier B. V. All rights reserved.
Enantioselective Palladium‐Catalyzed Hydrophosphinylation of Allenes with Phosphine Oxides: Access to Chiral Allylic Phosphine Oxides
作者:Zhiping Yang、Jun (Joelle) Wang
DOI:10.1002/anie.202112285
日期:2021.12.20
A highly efficient, versatile and atom-economic protocol to chiral allylic phosphineoxides is demonstrated via palladium-catalyzed asymmetric hydrophosphinylation of allenes with phosphineoxides. A family of chiral allylic phosphineoxides with a diverse range of functional groups were obtained in high yield (up to 99 %) and enantioselectivities (up to 99 % ee).
Catalytic Deoxygenative Coupling of Aromatic Esters with Organophosphorus Compounds
作者:Miki B. Kurosawa、Ryota Isshiki、Kei Muto、Junichiro Yamaguchi
DOI:10.1021/jacs.0c02839
日期:2020.4.22
We have developed a deoxygenative coupling of aromatic esters with diarylphosphine oxides/dialkyl phosphonates under palladium ca-talysis. In this reaction, aromatic esters can work as novel benzylation reagents to give the corresponding benzylic phosphorus compounds. The key of this reaction is the use of phenyl esters, an electron-rich diphosphine as a ligand, and sodium formate as a hydrogen source
我们开发了在钯催化下芳族酯与二芳基膦氧化物/二烷基膦酸酯的脱氧偶联。在该反应中,芳族酯可作为新型苄基化试剂生成相应的苄基磷化合物。该反应的关键是使用苯酯、富电子二膦作为配体,以及甲酸钠作为氢源。芳基羧酸也适用于该反应,使用 (Boc)2O 作为添加剂。钯/dcype 用于激活酯的酰基 CO 键并支持甲酸钠的还原。
Visible Light-Mediated Photocatalytic Metal-Free Cross-Coupling Reaction of Alkenyl Carboxylic Acids with Diarylphosphine Oxides Leading to β-Ketophosphine Oxides
作者:Hai-Feng Qian、Cheng-Kun Li、Zhi-Hao Zhou、Ze-Kun Tao、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1021/acs.orglett.8b02639
日期:2018.9.21
A new visible light-mediated photocatalytic decarboxylative oxyphosphorylation of cinnamicacids with diarylphosphine oxides is described. This reaction is performed under mild conditions to afford the corresponding β-ketophosphine oxides.
Enantioselective Coupling of Dienes and Phosphine Oxides
作者:Shao-Zhen Nie、Ryan T. Davison、Vy M. Dong
DOI:10.1021/jacs.8b11150
日期:2018.12.5
Pd-catalyzed intermolecular hydrophosphinylation of 1,3-dienes to afford chiral allylicphosphineoxides. Commodity dienes and air stable phosphineoxides couple to generate organophosphorus building blocks with high enantio- and regiocontrol. This method constitutes the first asymmetric hydrophosphinylation of dienes.
Site-Selective Functionalization of Pyridinium Derivatives via Visible-Light-Driven Photocatalysis with Quinolinone
作者:Inwon Kim、Gyumin Kang、Kangjae Lee、Bohyun Park、Dahye Kang、Hoimin Jung、Yu-Tao He、Mu-Hyun Baik、Sungwoo Hong
DOI:10.1021/jacs.9b02013
日期:2019.6.12
photocatalyst, we developed a catalytic system driven by visible light that forms phosphinoyl and carbamoyl radicals, which react with various heteroarenium derivatives under mild, transition-metal-free conditions. This straightforward and environmentally friendly synthetic method represents a new approach to site-divergent pyridine functionalization that offers considerable advantages in both simplicity and