نتایج جستجو برای: of aromatics

تعداد نتایج: 21164521  

Journal: :Chemical communications 2011
Christine Wiebe Claudine Schlemmer Stefan Weck Till Opatz

Mono- and diglycosylated aromatics and heteroaromatics may serve as building blocks for the construction of metabolically stable mimetics of oligosaccharides. Methods for their preparation from monosaccharidic precursors by direct C-glycosylation, dipolar cycloaddition or Larock cyclization are described.

Journal: :Organic letters 2006
Jarugu Narasimha Moorthy Parthasarathy Venkatakrishnan Sanchita Sengupta Mahiuddin Baidya

[reaction: see text] Aryl coumaryl ethylenes undergo oxidative photocyclization readily to yield helical pyrone-annulated condensed aromatics. The pyrones are conveniently converted to the corresponding photochromic diphenylpyrans/chromenes. Both pyrones and chromenes exhibit helicity-dependent fluorescence efficiency and persistence, respectively.

Journal: :Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology 2012
Norihiro Tada Yuki Ikebata Tomoya Nobuta Shin-ichi Hirashima Tsuyoshi Miura Akichika Itoh

This paper reports a useful method for facile direct syntheses of aromatic methyl esters from methyl aromatics by aerobic photo-oxidation using anthraquinone-2,3-dicarboxylic acid as an organophotocatalyst.

2014
Behnaz Ghaffari Sean M. Preshlock Donald L. Plattner Richard J. Staples Peter E. Maligres Shane W. Krska Robert E. Maleczka Milton R. Smith

Ir catalysts supported by bidentate silyl ligands that contain P- or N-donors are shown to effect ortho borylations for a range of substituted aromatics. The substrate scope is broad, and the modular ligand synthesis allows for flexible catalyst design.

2001
A. D’ANNA A. F. SAROFIM

Aromatics growth beyond 2-, 3-ring PAH is analyzed through a radical-molecule reaction mechanism which, in combination with a previously developed PAH model, is able to predict the size distribution of aromatic structures formed in rich premixed flames of ethylene at atmospheric pressure with C/O ratios across the soot threshold limit. Modeling results are in good agreement with experimental da...

2018
André Heeres Niels Schenk Inouk Muizebelt Ricardo Blees Bart De Waele Arend-Jan Zeeuw Nathalie Meyer Rob Carr Erwin Wilbers Hero Jan Heeres

Bio-aromatics (benzene, toluene, xylenes, BTX) were prepared by the catalytic pyrolysis of six different black liquors using both in situ and ex situ approaches. A wide range of catalysts was screened and conditions were optimized in microscale reactors. Up to 7 wt % of BTX, based on the organic fraction of the black liquors, was obtained for both the in situ and ex situ pyrolysis (T = 500-600 ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2007
Xinliang Zhou Zhenwei Su Andriy Anishkin W John Haynes Eric M Friske Stephen H Loukin Ching Kung Yoshiro Saimi

Transient receptor potential (TRP) channels are first elements in sensing chemicals, heat, and force and are widespread among protists and fungi as well as animals. Despite their importance, the arrangement and roles of the amino acids that constitute the TRP channel gate are unknown. The yeast TRPY1 is activated in vivo by osmotically induced vacuolar membrane deformation and by cytoplasmic Ca...

2015
Mihaela Marilena Stancu

Recently, there has been a lot of interest in the utilization of rhodococci in the bioremediation of petroleum contaminated environments. This study investigates the response of Rhodococcus erythropolis IBBPo1 cells to 1% organic solvents (alkanes, aromatics). A combination of microbiology, biochemical, and molecular approaches were used to examine cell adaptation mechanisms likely to be pursue...

Journal: :Trends in chemistry 2022

Polyketide synthases are extraordinarily complex enzymatic machineries that govern the assembly and cyclization of poly-β-carbonyl intermediates to an enormous diversity natural products. Captivatingly, this biosynthetic strategy is transferable retrosynthetic analysis unnatural aromatics, enabling strategic biomimetic polyketide cyclizations design extensive range otherwise unrelated aromatic

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