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1,042 Newest Publications about the topic phosphoric acid

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Molecules, Vol. 23, Pages 635: Development of Dipicolylamine-Modified Cyclodextrins for the Design of Selective Guest-Responsive Receptors for ATP

12-Mar-2018 | Yamada, Tatsuru ; Fujiwara, Shoji ; Fujita, Kyohhei ; Tsuchido, Yuji ; Hashimoto, Takeshi ; Hayashita, Takashi, Molecules, 2018

Molecules, Vol. 23, Pages 635: Development of Dipicolylamine-Modified Cyclodextrins for the Design of Selective Guest-Responsive Receptors for ATP Molecules doi: 10.3390/molecules23030635 Authors: Tatsuru Yamada Shoji Fujiwara Kyohhei Fujita Yuji Tsuchido Takeshi ...

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Catalytically Enantioselective Synthesis of Acyclic α-Tertiary Amines through Desymmetrization of 2-Substituted 2-Nitro-1,3-diols

18-Jan-2018 | Shan-Shui Meng; Wu-Bang Tang; Wen-Hua Zheng, Organic Letters, 2018

Highly enantioselective synthesis of acyclic α-tertiary amines through asymmetric desymmetrization is reported. This approach is based on chiral phosphoric acid mediated, enantioselective, oxidative desymmetrization of 2-substituted 2-nitro-1,3-diolbenzylidine acetals in the presence of DMDO as ...

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Regio and Enantioselective Organocatalytic Friedel–Crafts Alkylation of 4-Aminoindoles at the C7-Position

17-Jan-2018 | Wen Xun; Bo Xu; Bo Chen; Shanshui Meng; Albert S. C. Chan; Fayang G. Qiu; Junling Zhao, Organic Letters, 2018

A chiral phosphoric acid catalyzed highly regio- and enantioselective Friedel–Crafts alkylation at the indole C7-position was developed via the introduction of an alkylamine moiety at the C4-position of the indole ring. The methodology is applicable to a wide range of 4-aminoindoles and ...

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The structure of a lanthanide complex at an extractant/water interface studied using heterodyne-detected vibrational sum frequency generation

16-Jan-2018 | Ryoji Kusaka; Masayuki Watanabe, Physical Chemistry Chemical Physics, 2018

Solvent extraction plays an integral part in the separation and purification of metals. Because extractants generally used as complexing agents for metal extractions, such as di-(2-ethylhexyl)phosphoric acid (HDEHP) for lanthanide extractions, are amphiphilic, they come to an organic/water ...

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On the nanosecond proton dynamics in phosphoric acid–benzimidazole and phosphoric acid–water mixtures

13-Jan-2018 | Jan-Patrick Melchior; Bernhard Frick, Physical Chemistry Chemical Physics, 2018

The unique proton conduction mechanism of phosphoric acid is important for the functions of complex phosphate containing biological and technological systems (e.g. phospholipid membranes and polybenzimidazole phosphoric acid membranes for high-temperature PEM fuel cells). In neat phosphoric acid ...

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Crystallographic and topographical evolutions of a cylinder patterned sapphire substrate etched with a sulfuric acid and phosphoric acid mixture: an SEM and AFM study

13-Jan-2018 | Jian Shen; Dan Zhang; You Wang; Yang Gan, CrystEngComm, 2018

Crystallographic and topographical evolutions of a cylinder patterned sapphire substrate (PSS) under ordinary wet etching conditions (H2SO4 : H3PO4 = 5 : 1 volume ratio, 230 °C) were systematically studied using complementary SEM and AFM characterization techniques. The strongly time-dependent ...

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Catalytic Asymmetric Dearomatization of Indolyl Dihydropyridines via Enamine Isomerization/Spirocyclization/Transfer Hydrogenation Sequence

12-Jan-2018 | Shuli You, Zi-Lei Xia, Chao Zheng, Shou-Guo Wang, Angewandte Chemie International Edition, 2018

A highly efficient synthesis of enantioenriched spiroindolines by catalytic asymmetric dearomatization of indolyl dihydropyridines via chiral phosphoric acid catalyzed enamine isomerization/spirocyclization/transfer hydrogenation sequence has been developed. This reaction proceeds under mild ...

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Mechanistic Insight into Enantioselective Palladium‐Catalyzed Oxidative Carbocyclization‐Borylation of Enallenes

21-Dec-2017 | Jan-E. Bäckvall, Youai Qiu, Abraham Mendoza, Daniels Posevins, Fahmi Himo, Marcin Kalek, Chemistry - A European Journal, 2017

The asymmetric palladium‐catalyzed oxidative carbocyclization‐borylation of enallenes, employing a chiral phosphoric acid as co‐catalyst, constitutes an efficient and convenient entry into functionalized building blocks with cyclopentene scaffolds in high enantiopurity. Up till now there has ...

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Catalytic Enantioselective Synthesis of Mariline A and Related Isoindolinones through a Biomimetic Approach

02-Nov-2017 | Chang Min, Yingfu Lin, Daniel Seidel, Angewandte Chemie International Edition, 2017

Abstract The catalytic enantioselective synthesis of isoindolinones was achieved through the condensation of 2‐acyl‐benzaldehydes and anilines. In the presence of 1 mol % of a chiral phosphoric acid catalyst, reactions reach completion within 10 min and provide products with up to 98 % ee. ...

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Autocatalytic Oxidation of Trithionate by Iodate in a Strongly Acidic Medium

19-Oct-2017 | György Csekő; Changwei Pan; Qingyu Gao; Chen Ji; Attila K. Horváth, Journal of Physical Chemistry A, 2017

The trithionate–iodate reaction has been studied spectrophotometrically in an acidic medium at 25.0 ± 0.1 °C in phosphoric acid/dihydrogen phosphate buffer, monitoring the absorbance at 468 nm at the isosbestic point of the iodine–triiodide ion system and at I = 0.5 M ionic strength adjusted by ...

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