ChemInform Abstract: KINETICS, STOICHIOMETRY, AND MECHANISM IN THE BROMINATION OF AROMATIC HETEROCYCLES. PART 5. AQUEOUS BROMINATION OF BENZIMIDAZOLE, 1-METHYLBENZIMIDAZOLE, AND 2-METHYLBENZIMIDAZOLE

1978 ◽  
Vol 9 (50) ◽  
Author(s):  
D. J. EVANS ◽  
H. F. THIMM ◽  
B. A. W. COLLER
Keyword(s):  
Aromatic Heterocycles

Synthesis of Some Steroidal Derivatives with Side Chain of 20- and 22- Hydrazone Aromatic Heterocycles and their Antiproliferative Activity

2017 ◽  
Vol 13 (4) ◽  
pp. 375-383 ◽  
Author(s):  
Chunfang Gan ◽  
Liang Liu ◽  
Jianguo Cui ◽  
Zhiping Liu ◽  
Haixin Shi ◽  
...  
Keyword(s):  
Antiproliferative Activity ◽  
Side Chain ◽  
Aromatic Heterocycles ◽  
Steroidal Derivatives

scholarly journals Synthesis, oligomerization and catalytic studies of a redox-active Ni4-cubane: a detailed mechanistic investigation

RSC Advances ◽  
2021 ◽  
Vol 11 (37) ◽  
pp. 22849-22858
Author(s):  
Saroj Kumar Kushvaha ◽  
Maria Francis ◽  
Jayasree Kumar ◽  
Ekta Nag ◽  
Prathap Ravichandran ◽  
...  
Keyword(s):  
Nickel Complex ◽  
Efficient Catalyst ◽  
Aromatic Heterocycles ◽  
Redox Active ◽  
Mechanistic Investigation

A robust tetrameric nickel complex [Ni4((Oal−)2L-Me)4(s)4] (s = solvent) with cubane-like Ni4O4 core topology identified as the efficient catalyst for the diastereoselective cyclopropanation of aromatic heterocycles.

scholarly journals Easily accessible non-aromatic heterocycles with handles: 4-Bromo-2,3-dihydrofurans from 1,2-dibromohomoallylic alcohols

2021 ◽  
Author(s):  
Jason An ◽  
Jose Intano ◽  
Alissa Richard ◽  
Taehyun Kim ◽  
Jose Gascon ◽  
...  
Keyword(s):  
Intramolecular Cyclization ◽  
Aromatic Heterocycles

The first general preparation of 4-bromo-2,3-dihydrofurans is reported. These non-aromatic heterocyles containing a useful coupling handle are accessed via Cu-catalyzed intramolecular cyclization of 1,2-dibromohomoallylic alcohols, which are themselves available in...

Kinetics, stoicheiometry, and mechanism in the bromination of aromatic heterocycles. I. Aqueous bromination of pyrazole, 1-methylpyrazole, and 3,5-dimethylpyrazole

1971 ◽  
Vol 24 (7) ◽  
pp. 1413 ◽  
Author(s):  
BE Boulton ◽  
BAW Coller
Keyword(s):  
Aqueous Solution ◽  
Potentiometric Titration ◽  
Electrode Potential ◽  
Rate Coefficients ◽  
Molecular Bromine ◽  
Aromatic Heterocycles ◽  
Dilute Aqueous Solution ◽  
Direct Attack ◽  
Rate Behaviour ◽  
Bromide Solutions

A procedure is described for monitoring the reactivity of a substrate towards bromine in aqueous bromide solutions, as a function of extent of reaction, by following the changes of electrode potential with time in the intervals between successive periods of electrolysis. ��� The title compounds show 1 : 1 stoicheiometry with substitution in the 4-position. The observed rate behaviour may be understood in terms of direct attack by molecular bromine on the neutral substrate molecules, rate coefficients for dilute aqueous solution at 25�C being: ����� k20(Br2+pyrazole) = 3.8x105 dm3 mol-1 s-1, kH/kD = 1.39;����� k20(Br2+1.methylpyrazole) = 8.0x105 dm3 mol-1 s-1;����� k20(Br2+3,5-dimethylpyrazole) = 1.4x109 dm3 mol-1 s-1, kH/kD = 1.08 Values of pKa(pyrazole-H+) = 2.58 and pKa(3,5-dimethylpyrazole-H+) = 4.11 were determined by potentiometric titration methods.

Synthesis of new quinolizinium-based fluorescent compounds and application studies on photocatalysis

2021 ◽  
Author(s):  
Man Kin Wong ◽  
Wai-Ming Yip ◽  
Qiong Yu ◽  
Ajcharapan Tantipanjaporn ◽  
Wing-Cheung Chan ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Fluorescent Dyes ◽  
Aromatic Heterocycles ◽  
Dna Intercalators ◽  
Research Areas ◽  
Bridgehead Nitrogen ◽  
Fluorescent Compounds

Quinoliziniums, cationic aromatic heterocycles bearing a quaternary bridgehead nitrogen, have been widely applied to research areas, such as fluorescent dyes, DNA intercalators and ionic liquids. A library of new quinolizinium...

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