Metal-free decarbonylative alkylation–aminoxidation of styrene derivatives with aliphatic aldehydes and N-hydroxyphthalimide

2017 ◽  
Vol 15 (6) ◽  
pp. 1338-1342 ◽  
Author(s):  
Yu-Xia Li ◽  
Qi-Qiang Wang ◽  
Luo Yang
Keyword(s):  
Aliphatic Aldehydes ◽  
Metal Free ◽  
Styrene Derivatives ◽  
First Time

A convenient metal-free decarbonylative alkylation–aminoxidation of styrene derivatives with aliphatic aldehydes and N-hydroxyphthalimide (NHPI) to yield phthalimide protected alkoxyamines was developed for the first time.

Brønsted Acid-Catalyzed Solvent-Controlled Regioselective Hydrothiolation and Diastereoselective Cascade Cyclization of Dienes

2021 ◽  
Author(s):  
Kai Ji ◽  
Ka Lu ◽  
Jie Huang ◽  
Zi-Hao Li ◽  
Tong-Mei Ding ◽  
...  
Keyword(s):  
Free Atom ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Metal Free ◽  
Cascade Cyclization ◽  
Brönsted Acid ◽  
Acid Catalyzed ◽  
First Time

A highly regio- and diastereo-selective Brønsted acid-catalyzed tandem hydrothiolation/Friedel-Crafts reaction of linear 1,3-dienes has been developed for the first time, which provides a metal-free, atom-economic and concise way of constructing...

scholarly journals A practical way to synthesize chiral fluoro-containing polyhydro-2H-chromenes from monoterpenoids

2016 ◽  
Vol 12 ◽  
pp. 648-653 ◽  
Author(s):  
Oksana S Mikhalchenko ◽  
Dina V Korchagina ◽  
Konstantin P Volcho ◽  
Nariman F Salakhutdinov
Keyword(s):  
Aromatic Aldehydes ◽  
Single Step ◽  
Preparative Synthesis ◽  
Aliphatic Aldehydes ◽  
First Time

Conditions enabling the single-step preparative synthesis of chiral 4-fluoropolyhydro-2H-chromenes in good yields through a reaction between monoterpenoid alcohols with para-menthane skeleton and aldehydes were developed for the first time. The BF3·Et2O/H2O system is used both as a catalyst and as a fluorine source. The reaction can involve aliphatic aldehydes as well as aromatic aldehydes containing various acceptor and donor substituents. 4-Hydroxyhexahydro-2H-chromenes were demonstrated to be capable of converting to 4-fluorohexahydro-2H-chromenes under the developed conditions, the reaction occurs with inversion of configuration.

Black phosphorus as a metal-free, visible-light-active heterogeneous photoredox catalyst for the direct C–H arylation of heteroarenes

2020 ◽  
Vol 56 (44) ◽  
pp. 5901-5904 ◽  
Author(s):  
Erbay Kalay ◽  
Hüseyin Küçükkeçeci ◽  
Haydar Kilic ◽  
Önder Metin
Keyword(s):  
Visible Light ◽  
Black Phosphorus ◽  
Diazonium Salts ◽  
Metal Free ◽  
Visible Light Active ◽  
First Time

We report for the first time the employment of black phosphorus (BP) as a metal free, visible-light-active and reusable heterogeneous photoredox catalyst for the direct C–H arylation of heteroarenes (furan and thiophene) with aryl diazonium salts.

FABRICATED METAL-FREE CARBON NITRIDE CHARACTERIZATIONS FOR FLUORESCENCE CHEMICAL SENSOR OF NITRATE IONS

2015 ◽  
Vol 76 (13) ◽  
Author(s):  
Nor Shuhada Alim ◽  
Hendrik O. Lintang ◽  
Leny Yuliati
Keyword(s):  
Carbon Nitride ◽  
Diffuse Reflectance ◽  
Chemical Sensor ◽  
Thermal Polymerization ◽  
Fluorescence Sensor ◽  
Free Carbon ◽  
Metal Free ◽  
Nitrate Ions ◽  
Relative Standard ◽  
First Time

In this study, a metal-free carbon nitride (CN) was investigated for the first time as a potential fluorescence sensor for detection of nitrate ions (NO3-). The CN was prepared through thermal polymerization of urea precursor at 823 K and characterized by diffuse reflectance ultraviolet-visible (DR UV-Vis), Fourier transform infrared (FTIR), and fluorescence spectroscopies. The DR UV-Vis spectrum confirmed that CN could absorb light up to 450 nm. On the other hand, the FTIR spectrum revealed the presence of graphitic CN single and double bond characters in the 800-1700 cm-1 region. From the fluorescence spectroscopy, three excitation peaks at 278, 310 and 369 nm were observed due to the presence of N=C, C=O and N-C groups, respectively. The fluorescence sensor capability of the CN was then investigated using concentrations of NO3- in the range of 300-1800 mM. It was confirmed that the intensities of the emission sites were quenched linearly with the concentrations of the NO3-. The CN showed good reproducibility with relative standard deviation (RSD) values were 1.5-7.2%.  These results suggested that CN can act as the fluorescence sensor for NO3-.

Transition-Metal-Free, Intermolecular Azidoheteroarylation of Alkenes: Efficient Access to β-Azidoalkylated Quinoxalinones and Preliminary Antifungal Evaluation Against Magnaporthe grisea

Synthesis ◽  
2020 ◽  
Vol 52 (16) ◽  
pp. 2395-2409
Author(s):  
Weiwei Qin ◽  
Zhaodong Li ◽  
Yiming Du ◽  
Yue Chen ◽  
Yun-Lin Liu
Keyword(s):  
Transition Metal ◽  
Magnaporthe Grisea ◽  
Single Step ◽  
Domino Reaction ◽  
Efficient Synthesis ◽  
Metal Free ◽  
Efficient Access ◽  
First Time ◽  
Antibacterial Evaluation ◽  
Addition Pathway

An efficient, PhI(OAc)2-mediated, radical azidoheteroarylation of alkenes under transition-metal-free conditions is reported by employing TMSN3 and quinoxalin-2(1H)-ones as coupling partners. This domino reaction allows an efficient synthesis of valuable orangoazides containing quinoxalin-2(1H)-one derivatives and could be extended to phosphinyl-alkylated quinoxalin-2(1H)-one in a single step in moderate to excellent yields under mild conditions, as demonstrated by the preliminary antibacterial evaluation against Magnaporthe grisea for the first time. Mechanistic studies revealed that this transformation undergoes a cascade addition pathway controlled by a polar radical.

Metal-Free Addition of Boronic Acids to Silylnitronates

Synlett ◽  
2020 ◽  
Vol 31 (09) ◽  
pp. 856-860
Author(s):  
Laurent El Kaïm ◽  
Mansour Dolé Kerim ◽  
Pakoupati Boyode ◽  
Julian Garrec
Keyword(s):  
Reaction Mechanism ◽  
Double Bond ◽  
Boronic Acids ◽  
Dft Study ◽  
Metal Free ◽  
Nitro Derivatives ◽  
Oxime Derivatives ◽  
Nitrogen Double Bond ◽  
First Time ◽  
Aryl Transfer

We report for the first time a metal-free addition of boronic acids to silylnitronates to afford oxime derivatives through aryl transfer on the carbon nitrogen double bond. A reaction mechanism has been proposed in relation with a DFT study on the key aryl transfer. This arylation process is effective for cycloalkenyl nitro derivatives leading to oximes that may be oxidatively converted into 3-arylisoxazole derivatives.

Efficient imidation of C(sp3)–H bonds adjacent to oxygen atoms of aryl ethers under metal-free conditions

2014 ◽  
Vol 50 (85) ◽  
pp. 12880-12883 ◽  
Author(s):  
Kai Sun ◽  
Xin Wang ◽  
Gang Li ◽  
Zhonghong Zhu ◽  
Yongqing Jiang ◽  
...  
Keyword(s):  
Formation Reaction ◽  
Metal Free ◽  
Aryl Ethers ◽  
First Time ◽  
Oxygen Atoms

A metal-free intermolecular oxidative C–N formation reaction of aryl ethers with saccharins was realized for the first time.

Molecular design of new organic sensitizers based on thieno[1,4]benzothiazine for dye-sensitized solar cells

RSC Advances ◽  
2015 ◽  
Vol 5 (70) ◽  
pp. 56865-56871 ◽  
Author(s):  
Hu Liu ◽  
Xingrong Liao ◽  
Xiaoyu Li ◽  
Di Wu ◽  
Qiang Guo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Molecular Design ◽  
Dye Sensitized Solar Cells ◽  
Metal Free ◽  
Dye Sensitized ◽  
First Time ◽  
Sensitized Solar Cells ◽  
Organic Sensitizers

A novel thieno[1,4]benzothiazine donor has been developed for the first time to construct metal-free organic sensitizers, which exhibit more dramatically red-shifted absorptions than phenothiazine-based dyes.

Absorption and magnetic circular dichroism spectra of metal-free phthalocyanine in ultraviolet-transparent solvents

1979 ◽  
Vol 57 (9) ◽  
pp. 1111-1113 ◽  
Author(s):  
Katherine A. Martin ◽  
Martin J. Stillman
Keyword(s):  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
Electron System ◽  
Spectral Envelope ◽  
Central Metal ◽  
Circular Dichroism Spectra ◽  
Metal Free ◽  
First Time ◽  
Circular Dichroïsm ◽  
Magnetic Circular Dichroism Spectra

Absorption and magnetic circular dichroism spectra of metal-free phthalocyanine (H2Pc) have been recorded over the range 270–800 nm. The use of solvents transparent in the 270–400 nm region allows the observation for the first time of the B band spectral envelope of H2Pc in solution. The mcd spectrum clearly indicates that the complex (NH4)2Pc is formed when ammonia is bubbled through a solution of H2Pc in dimethyl sulphoxide. The multi-transition nature of the B band region is identified as a property of the phthalocyanine π electron system rather than arising from charge transfer between the ring and a central metal cation.

1,2-Arylalkylation of N-(arylsulfonyl)acrylamides using aliphatic aldehydes as the alkyl source

2017 ◽  
Vol 15 (26) ◽  
pp. 5476-5479 ◽  
Author(s):  
Jin-Tao Yu ◽  
Rongzhen Chen ◽  
Jiawei Zhu ◽  
Jiang Cheng
Keyword(s):  
Alkyl Radical ◽  
Aliphatic Aldehydes ◽  
Metal Free

A metal-free decarbonylative arylalkylation of N-(arylsulfonyl)acrylamides using aliphatic aldehydes as the alkyl radical source was developed.

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