Results 211 to 220 of about 147,295 (272)

Catalytic Enantioselective Alkylation of Prochiral Enolates.

Chemical Reviews, 2021
The asymmetric alkylation of enolates is a particularly versatile method for the construction of α-stereogenic carbonyl motifs, which are ubiquitous in synthetic chemistry.
Timothy B. Wright, P. Evans
semanticscholar   +1 more source

Unactivated Alkyl Halides in Transition-Metal-Catalyzed C–H Bond Alkylation

, 2021
Alkylation represents an important organic transformation in molecular science to develop privileged alkylated arenes and heteroarenes.
Shidheshwar B. Ankade, Anand B. Shabade, V. Soni, Benudhar Punji   +3 more
semanticscholar   +1 more source

Visible-Light-Promoted C(sp3)-H Alkylation by Intermolecular Charge Transfer: Preparation of Unnatural α-Amino Acids and Late-stage Modification of Peptides.

Angewandte Chemie, 2020
Disclosed herein is the visible-light promoted deaminative C(sp3)-H alkylation of glycine and peptides using Katritzky salts as electrophiles. Simple reaction conditions and excellent functional-group tolerance provided a general strategy for the ...
Chao Wang, Rupeng Qi, H. Xue, Yuxuan Shen, M. Chang, Yaqiong Chen, Rui Wang, Zhao-Qin Xu   +7 more
semanticscholar   +1 more source

Alkylating enzymes

Current Opinion in Chemical Biology, 2013
Chemospecific and regiospecific modifications of natural products by methyl, prenyl, or C-glycosyl moieties are a challenging and cumbersome task in organic synthesis. Because of the availability of an increasing number of stable and selective transferases and cofactor regeneration processes, enzyme-assisted strategies turn out to be promising ...
Ludger A Wessjohann, Jeanette Keim, Benjamin Weigel, Martin Dippe   +3 more
openaire   +2 more sources

Analysis of alkyl phosphates by extractive alkylation

Bulletin of Environmental Contamination and Toxicology, 1981
The development of suitable methods for analysis of the alkyl phosphate metabolites of organophosphorus pesticides in urine has been a rather d i f f i cu l t and persistent problem. Currently available methodology (BRADWAY et al. 1977; LORES & BRADWAY 1977; SHAFIK et al. 1973) suffers from several shortcomings.
Robert F. Moseman, Diane E. Bradway, Randy May   +2 more
openaire   +3 more sources

Polarity Umpolung Strategy for the Radical Alkylation of Alkenes.

Angewandte Chemie, 2020
Free radical-mediated alkylation of general alkenes is a challenging and largely unmet goal. Herein, we disclose a conceptually novel "polarity umpolung" strategy for radical alkylation of alkenes using a portfolio of easily-accessed, dual-function ...
Jige Liu, Shuo Wu, Jiajia Yu, Chenxi Lu, Zhen Wu, Xinxin Wu, Xiao-song Xue, Chen Zhu   +7 more
semanticscholar   +1 more source

The Alkylating Properties of Alkyl Thiophosphates

Angewandte Chemie International Edition in English, 1965
AbstractThiophosphate and phosphate esters have been synthesized in great variety since about 1945, and are being produced in increasing quantities, mainly for plant protection. An important property of alkyl phosphates and thiophosphates is their alkylating power, which is comparable with that of dialkyl sulfates and alkyl p‐toluenesulfonates.
G. Hilgetag, H. Teichmann
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Solution properties of alkyl glucosides, alkyl thioglucosides and alkyl maltosides

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2004
Abstract Aqueous solutions containing sugar-based surfactants, alkyl glucosides, thioglucosides and maltosides, have been investigated in a wide concentration range, at different temperatures. Colligative properties (freezing point and vapour pressure depression), volumetric, adiabatic compressibility, surface tension and calorimetric methods were ...
Antonio Capalbi, Giacomo Gente, LA MESA, Camillo   +2 more
openaire   +3 more sources

Visible-Light-Driven N-Heterocyclic Carbene-catalyzed γ- and ε-Alkylation with Alkyl Radicals.

Angewandte Chemie, 2019
The merging of photoredox catalysis and N-heterocyclic carbene (NHC) catalysis for γ- and ε-alkylation of enals with alkyl radicals was developed.
L. Dai, Zi‐Hao Xia, Yuan-Yuan Gao, Zhong-Hua Gao, Song Ye   +4 more
semanticscholar   +1 more source

Visible-Light-Initiated Decarboxylative Alkylation of Quinoxalin-2(1H)-ones with Phenyliodine(III) Dicarboxylates in Recyclable Ruthenium(II) Catalytic System

ACS Sustainable Chemistry and Engineering, 2019
A efficient and sustainable approach for the synthesis of 3-alkylquinoxalin-2(1H)-ones has been developed through visible-light-mediated decarboxylative alkylation of quinoxalin-2(1H)-ones with phenyliodine(III) dicarboxylates.
Long-Yong Xie, Li-Lin Jiang, Jia-Xi Tan, Yi Wang, Xiang-Qin Xu, Bo Zhang, Zhong Cao, Wei-Min He   +7 more
semanticscholar   +1 more source