A Serendipitous Synthesis: SiO 2 ‐HNO 3 Mediated Oxidative Aromatization and Regioselective Nitration of 1,3,5‐Trisubstituted‐4,5‐Dihydro‐1 H ‐Pyrazoles

2019 ◽  
Vol 4 (35) ◽  
pp. 10417-10424 ◽  
Author(s):  
Rimpy Bhatia ◽  
Kulbir Kadyan ◽  
Meenakshi Duhan ◽  
Meena Devi ◽  
Rahul Singh ◽  
...  
Keyword(s):  
Oxidative Aromatization ◽  
Regioselective Nitration

The Synthesis of New Selenium-containing Heterocycles by the Oxidation Reaction of 2,4-Diaryltetrahydro-4H-selenochromenes

2020 ◽  
Vol 24 (15) ◽  
pp. 1663-1668
Author(s):  
Dmitriy Yurievich Direnko ◽  
Boris Ivanovich Drevko ◽  
Yaroslav Borisovich Drevko
Keyword(s):  
Nucleophilic Substitution ◽  
Chlorine Atom ◽  
Oxidation Reaction ◽  
Heterocyclic Fragment ◽  
Oxidative Aromatization

We have explored the reactions of tetrahydro-4H-selenochromenes in the presence of phosphoric pentachloride, and synthesized new condensate aroylbenzoselenophenes. During the reactions, tetrahydro-4H-selenochromenes with phosphoric pentachloride underwent oxidative aromatization and nucleophilic substitution for a chlorine atom of one of the protons in the alicyclic fragment. Also, the narrowing of the heterocyclic fragment occurred as in synthesized selenium-containing compounds earlier transformed into the corresponding condensate aroylbenzoselenophenes.

Regioselective nitration of anilines with Fe(NO3)3·9H2O as a promoter and a nitro source

2018 ◽  
Vol 16 (21) ◽  
pp. 3881-3884 ◽  
Author(s):  
Yang Gao ◽  
Yuanyou Mao ◽  
Biwei Zhang ◽  
Yingying Zhan ◽  
Yanping Huo
Keyword(s):  
Aniline Derivatives ◽  
Regioselective Nitration

A novel and efficient ortho-nitration reaction of aniline derivatives using the inexpensive and nontoxic Fe(NO3)3·9H2O as a promoter and a nitro source has been developed.

Solid-state regioselective nitration of activated hydroxyaromatics and hydroxycoumarins with cerium (IV) ammonium nitrate

2005 ◽  
Vol 2005 (11) ◽  
pp. 733-735 ◽  
Author(s):  
Nemai C. Ganguly ◽  
Sanjoy Dutta ◽  
Mrityunjoy Datta ◽  
Prithwiraj De
Keyword(s):  
Solid State ◽  
Ammonium Nitrate ◽  
High Efficiency ◽  
Solvent Free ◽  
High Melting ◽  
Microwave Assisted ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Regioselective Nitration ◽  
Cerium Iv Ammonium Nitrate

Predominant ortho-selective mononitration of low-melting and liquid phenols and hydroxycoumarins in moderate to high yields has been accomplished upon grinding with solid cerium (IV) ammonium nitrate (CAN). Microwave-assisted expeditious CAN-mediated nitration of relatively high melting phenols and hydroxycoumarins with high efficiency and selectively under solvent-free conditions has been also developed to address the problems of sluggishness and low yield for these reluctant substrates.

Thermal Non-Oxidative Aromatization of Light Alkanes Catalyzed by Gallium Nitride

2014 ◽  
Vol 53 (51) ◽  
pp. 14106-14109 ◽  
Author(s):  
Lu Li ◽  
Xiaoyue Mu ◽  
Wenbo Liu ◽  
Xianghua Kong ◽  
Shizhao Fan ◽  
...  
Keyword(s):  
Gallium Nitride ◽  
Light Alkanes ◽  
Oxidative Aromatization
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