Results 221 to 230 of about 5,168,439 (286)

Chiral Phosphoric Acids in Metal-Organic Frameworks with Enhanced Acidity and Tunable Catalytic Selectivity.

Angewandte Chemie, 2019
New heterogeneous Brønsted acid catalysts with high activity and selectivity are critically needed to substitute precious acid-based catalysts for the sustainable production of fine and commodity chemicals.
Xu Chen, Hong Jiang, Xu Li, Bang Hou, W. Gong, Xiaowei Wu, Xing Han, F. Zheng, Yan Liu, Jianwen Jiang, Yong Cui   +10 more
semanticscholar   +1 more source

Palladium(II)-Catalyzed Enantioselective Arylation of Unbiased Methylene C(sp3 )-H Bonds Enabled by a 2-Pyridinylisopropyl Auxiliary and Chiral Phosphoric Acids.

Angewandte Chemie, 2018
Enantioselective functionalizations of unbiased methylene C(sp3 )-H bonds of linear systems by metal insertion are intrinsically challenging and remain a largely unsolved problem.
Shengyi Yan, Ye-Qiang Han, Qi-Jun Yao, Xingliang Nie, Lei Liu, Bingfeng Shi   +5 more
semanticscholar   +1 more source

3-Mono-Substituted BINOL Phosphoric Acids as Effective Organocatalysts in Direct Enantioselective Friedel-Crafts-Type Alkylation of N-Unprotected α-Ketiminoester.

Chemistry, 2018
Although BINOL-derived phosphoric acids are among the most widely used chiral Brønsted acid organocatalysts, their structures are mostly limited to 3,3'-disubstituted ones and simple 3-mono-substituted ones without any polar functionalities on the 3 ...
Ryohei Yonesaki, Yutaka Kondo, Walaa Akkad, Masanao Sawa, Kazuhiro Morisaki, H. Morimoto, T. Ohshima   +6 more
semanticscholar   +1 more source

Carbohydrate Phosphorylation with Phosphoric Acid, Polyphosphoric Acid, Pyrophosphoric Acid, and Anhydrous Phosphoric Acid

Synthetic Communications, 1971
Abstract Pyrophosphoric acid was first reported as a phosphorylating agent for highmolecular weight alcohols in 19341. Direct phosphorylating of sugars and sugar derivatives was first carried out by Cherbuliez2 who used polyphosphoric acid on alcohols, amines and glycols.
openaire   +1 more source

Phosphoric acid pyreolidides

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1969
The pyrrolidides of phosphorous, phosphoric, thiophosphoric, and alkyldichlorovinylphosphoric acids have been prepared. The insecticidal and fungicidal properties as well as the toxicity of some of the synthesized compounds have been investigated.
N. P. Grechkin, L.N. Grishina
openaire   +1 more source

REE extraction from phosphoric acid, phosphoric acid sludge, and phosphogypsum

Mineral Processing and Extractive Metallurgy, 2015
AbstractPhosphate rock is considered a secondary source of rare earth elements (REE), which are usually found in isomorphism substitution with Ca2+ ion. It approximately assays 0·01–0·1% (100–1000 μg g−1). Large tonnages of phosphate ore are mined and processed annually to manufacture commercial grade phosphoric acid indicating that REE extraction from
S. Al-Thyabat, P. Zhang
openaire   +1 more source

ChemInform Abstract: Obtaining Pure Phosphoric Acid from Wet Phosphoric Acid.

ChemInform, 1992
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
C. BEJAN, R. CATUNEANU, L. STOICA
openaire   +1 more source

PHOSPHORIC ACID

2011
  +5 more sources

Development and application of chiral spirocyclic phosphoric acids in asymmetric catalysis.

Organic and biomolecular chemistry, 2018
Abdul Rahman, Xufeng Lin
semanticscholar   +1 more source

Highly Enantioselective Biginelli Reaction of Aliphatic Aldehydes Catalyzed by Chiral Phosphoric Acids

Synlett : Accounts and Rapid Communications in Synthetic Organic Chemistry, 2017
Yongbiao Guo, Zhenhuan Gao, Xiangyan Meng, Gui-Qing Huang, H. Zhong, Hui‐zhen Yu, Xiaoqin Ding, Hui Tang, Chuanpin Zou   +8 more
semanticscholar   +1 more source