Phosphorylmethylpyridines and their N-oxides: Synthesis and equilibrium CH-acidity
摘要:
Certain phosphorylmethylpyridines and their N-oxides were synthesized, which are of interest as extractants and complex-forming agents. Their equilibrium CH-acidity with reference to 9-phenylfluorene (K+ counterion) was studied by the indicator method in dimethyl sulfoxide. The acidifying action of a series of pyridine groupings was characterized by means of sigma-C- values.
Syntheses and coordination chemistry of methylpyridylphosphine oxide ligands with copper(II)
摘要:
The coordination properties of three heterofunctional phosphine oxide ligands, 2-methylpyridyldiphenylphosphine oxide (L1), phenylphosphino-bis-2-methylpyridine oxide (L2) and phenylphosphino-bis-2-methylpyridine N,N',P-trioxide (L3) with Cu(II) is described. The X-ray crystal structures of the compounds display a distorted octahedral geometry, which exhibit Jahn-Teller distortions. In compounds 1 and 2, the L1 and 12 ligands react with Cu(BF4)(2) in a 2:1 ligand to metal ratio, respectively, with the BF4 anions interacting with the metal center. L3 reacts with Cu(BF4)(2) in 1:1 and 2:1 ligand/metal ratios to form compounds 3 and 4, respectively. Addition of either 2,2'-bipyridine or 4,4'-bipyridine to reaction solutions containing Cu(BF4)(2) and U produces a discrete molecule (5) and a polymeric structure (7), respectively. The reaction of both bipyridines in the presence of Cu(BF4)(2) and L3 gives rise to a discrete molecule (6) characterized by two octahedral coppers interconnected by the 4,4'-bipyridine. The electrochemical and photophysical properties of all compounds were investigated by cyclic voltammetry (CV) and UV-Vis, as they exhibited no emission or excitation in fluorimetric experiments. (C) 2010 Elsevier Ltd. All rights reserved.
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。
Synthesis and Properties of New (Phosphinoylmethyl)Pyridine N-Oxides
作者:Sylvie L. Pailloux、Daniel Rosario-Amorin、Manab Chakravarty、Jean-Michel Camus、Karen Ann Smith、Eileen N. Duesler、Diane A. Dickie、Robert T. Paine、Kevin K. Klausmeyer、Daniel A. Padron、Benjamin P. Hay、Laetitia H. Delmau
DOI:10.1002/zaac.201300099
日期:2013.6
-oxy-pyridin-2yl)methyl]pyridine N-oxides (5a, b) and the 2-[1-(diarylphosphinoyl)-1, 1-bis(1-oxy-methylpyridin-2-yl)methyl]pyridines (6a, b), respectively. The “short-arm“ pyridine fragment of 11a, b resists N-oxidation, and the fully oxidized molecules, 2-[1-(diarylphosphinoyl)-1, 1-bis(1-oxy-methylpyridin-2-yl)methyl]pyridine N-oxides (7a, b) were not isolated. Molecular mechanics calculations for
Copper(II) Acetate‐Catalyzed Synthesis of Phosphorylated Pyridines
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Denitrogenative C−P Coupling between Pyridotriazoles and P(O)H Compounds
作者:Ruwei Shen、Chao Dong、Jianlin Yang、Li‐Biao Han
DOI:10.1002/adsc.201800909
日期:2018.11.5
A new inexpensive copper‐catalyzed denitrogenative C−P coupling reaction of pyridotriazoles with P(O)H compounds has been developed. The reaction proceeds via a process of copper‐catalyzed P(O)−H insertion into the pyridyl carbene intermediates generated in situ from pyridotriazoles. This reaction provides a new and effective method for the synthesis of a variety of 2‐picolylphosphoryl compounds.
Synthesis, Lanthanide Coordination Chemistry, and Liquid–Liquid Extraction Performance of CMPO-Decorated Pyridine and Pyridine <i>N</i>-Oxide Platforms
作者:Daniel Rosario-Amorin、Sabrina Ouizem、Diane A. Dickie、Yufeng Wen、Robert T. Paine、Jian Gao、John K. Grey、Ana de Bettencourt-Dias、Benjamin P. Hay、Lætitia H. Delmau
DOI:10.1021/ic3025342
日期:2013.3.18
tetradentate chelate structures are obtained for several 1:1 complexes of 9 while a pentadentate chelate structure is observed with 10. Emission spectroscopy for one complex, [Eu(9)(NO3)3], in methanol, shows that the Eu(III) ion resides in a low-symmetry site. Lifetime measurements for methanol and deuterated methanol solutions indicate the presence of four methanol molecules in the inner coordination sphere
描述了一组新的配体的合成,所述新的配体包含一个或两个连接在吡啶和吡啶N-氧化物平台上的氨基甲酰基甲基膦氧化物(CMPO)片段。分子力学分析为吡啶气相镧系元素-配体相互作用Ñ -oxides指示该三官能NOPOCO分子,2 - [PH 2 P(O)] [C(O)净2 ] C(H)}℃ 5 ħ 4 NO(7)和2-[Ph 2 P(O)] [C(O)NEt 2 ] CHCH 2 } C 5 H 4 NO(8)和五官能NOPOP'O'COC'O'分子,2 ,6-[Ph 2 P(O)] [C(O)NEt2 ] C(H)} 2 C 5 H 3 NO(9)和2,6-[Ph 2 P(O)] [C(O)NEt 2 ] CHCH 2 } 2 C 5 H 3 NO(10)应当能够以最小的应变分别采用三齿和五齿螯合物结构。作为对这些预测的检验,对N-氧化物衍生物的选定镧系配位化学进行了研究。晶体结构分析揭示了含有7而8的1:1
Palladium(II) and platinum(II) derivatives with N,O ligands
The preparation of a series of Pd(II) and Pt(II) derivatives with three N,O hybrid ligands 1-(2-pyridyl)ethyldiphenylphosphine oxide, L1; (2-pyridyl)methyldiphenylphosphine oxide, L2 and 2-pyridyldiphenylphosphine oxide, L3 is described. Depending on the ligand to metal molar ratio, either 1∶1 [LMCl2] [L1PdCl2] 1, [L2PdCl2] 2, [L3PdCl2] 3, [L1PtCl2] 4} or 2∶1 [L2MCl2] [L12PdCl2] 5, [L22PdCl2] 6, [L12PtCl2]