ChemInform Abstract: Lewis Acidity, Basicity, H-Bonding and Complexing of Organic Arsenic, Antimony and Bismuth Compounds

Molecular sieves with beta zeolite topology are promising catalysts for various reactions as they exhibits extraordinary Lewis acidity. However, their industrial application and related research in academica is hindered because their synthesis is time consuming and typically involves toxic chemicals as hydrofluoric acid. Therefore, tetraethylammonium fluorid was tested as a non-toxic fluotide source for the synthesis of beta zeolites. In combination with the previously reported nano-seeded growth method, a fast synthesis of beta zeolites only involving non-toxic chemicals was possible. Synthesized zeolites show comparable selectivity in the Bayer-Villinger oxidation as conventional zeolites synthesized with hydrofluoric acid.<br>

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Chemistry of N-F Containing HEDM Materials and on Lewis Acidity of LiF

10.21236/ada408393 ◽

2000 ◽

Author(s):

Vandana Vij ◽

Ashwani Vij ◽

William W. Wilson ◽

Karl O. Christe ◽

Jeffery A. Sheehy

Keyword(s):

Lewis Acidity

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On a Quantitative Scale for Lewis Acidity and Recent Progress in Polynitrogen Chemistry

10.21236/ada411235 ◽

1999 ◽

Author(s):

Karl O. Christe ◽

David A. Dixon ◽

Douglas McLemore ◽

William W. Wilson ◽

Jeffrey A. Sheehy

Keyword(s):

Recent Progress ◽

Lewis Acidity

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Zinc Sulfamate Catalyzed Efficient Selective Synthesis of Benzimidazole Derivatives under Ambient Conditions

Letters in Organic Chemistry ◽

10.2174/1570178616666181211094040 ◽

2019 ◽

Vol 16 (9) ◽

pp. 740-749

Author(s):

Sushil R. Mathapati ◽

Arvind H. Jadhav ◽

Mantosh B. Swami ◽

Jairaj K. Dawle

Keyword(s):

Benzimidazole Derivative ◽

Sulfamic Acid ◽

Aromatic Aldehydes ◽

Catalytic Amount ◽

Product Yield ◽

Lewis Acidity ◽

Benzimidazole Derivatives ◽

Ambient Conditions ◽

Reaction Condition ◽

Green Approach

Zinc sulfamate (Zn(NH2SO3)2 is a derivative of sulfamic acid (H3NSO3) which possesses “Lewis acidity” and finds well suited in a number of catalytic applications. The present paper describes an efficient, eco-friendly, and clean synthesis of 2-substituted benzimidazole derivatives by reacting diverse o-phenylenediamine with various substituted aromatic aldehydes using a catalytic amount of zinc sulfamate in ethanol at ambient temperature. As a result, 10 mol.% of Zinc sulfamate catalyst showed 92% of respective product yield with 100% conversion using short reaction period in ethanol. Meanwhile, effect of reaction parameters, such as amount of catalyst, different solvents, and reaction temperature on reaction product, was also studied. In addition, in the optimized reaction condition various substituted biological important benzimidazoles derivatives were prepared by using optimized reaction condition in good to efficient yield. In addition, possible reaction mechanism in the presence of zinc sulfamate for the preparation of benzimidazole derivative was sketched and discussed. The present green approach showed significances with faster reaction rate with inexpensive catalyst, which showed excellent and clean yield of benzimidazole in mild reaction condition with easy work-up procedure.

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