نتایج جستجو برای: compounds

تعداد نتایج: 226639  

2004
ALAA EL-SHAFEI

Potentiometric pKa and polarographic behaviour of I ,3-indandione-monoxime-2-phenyl azo and four of its substituted derivatives were investigated in buffer solution of pH -2-12. The results showed that the compounds are in the azo-form, where its reduction wave precedes that of the oxime. A mechanism for the electrodic processes was proposed. Half-wave potentials showed fair correlation with Ha...

Journal: :Molecules 2011
Nagwa Mohamed Mahrous Hamada Essam Mohamed Sharshira

Some new heterocyclic compounds containing isoxazole, pyrazole and oxadiazole ring systems were prepared from various chalcones. The synthesized compounds have been characterized by elemental analysis and spectral methods. These compounds were screened for their antimicrobial activities.

Journal: :Journal of the Pharmaceutical Society of Japan 2021

In the 1980s, authors developed enzyme immunoassay (EIA) system for mouse nerve growth factor (NGF) to clarify its important physiological roles. Our EIA was a new and powerful tool measurement of extremely low levels NGF in vitro vivo, it contributed investigation into regulatory mechanism synthesis. After that, we demonstrated that compounds with molecular weight, such as 4-methylcatechol, wh...

Journal: :The Journal of physical chemistry 1972
W D O'Brien F Dunn

of an internal rotation; the greater time for the carbon compound indicates some frictional resistance to rotation. Both dimethoxy compounds have similar relaxation times, as also have the tetramethoxy compounds. The greater size and substantially higher dipole moments of the silicon compounds, however, should produce a proportionately greater contribution from the molecular tumbling motion. Th...

Journal: :Molecules 2016
Amine Kaddes Olivier Parisi Chadi Berhal Sofiene Ben Kaab Marie-Laure Fauconnier Bouzid Nasraoui M Haissam Jijakli Sébastien Massart Caroline De Clerck

This study aimed to determine the effect of Volatile Organic Compounds (VOCs) on some pathogens, these VOCs were emitted during interactions of barley with Fusarium culmorum Schltdl and/or Cochliobolus sativus Shoemaker, two common root rot pathogens. Our work shows that two organic esters: methyl propanoate (MP) and methyl prop-2-enoate (MA) significantly reduced the development of fungi in vi...

Journal: :Organic letters 2016
Saumen Hajra Sk Mohammad Aziz Bibekananda Jana Prosenjit Mahish Dhiraj Das

A general and direct strategy for the synthesis of chiral spiro-aziridine oxindoles has been developed via an aza-Corey-Chaykovsky reaction of isatin-derived N-tert-butanesulfinyl ketimines with excellent selectivity (dr = 98:2 to >99:1). The method is explored for the synthesis of chiral 3-substituted spiro-aziridine oxindoles with high (2S,3S)-selectivity over (2S,3R).

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