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16 results on '"Maras, A"'

1. ChemInform Abstract: Boric Acid-Catalyzed Direct Condensation of Carboxylic Acids with Benzene-1,2-diamine into Benzimidazoles

Author

Nenad Maras and Marijan Kočevar

Subjects
Boric acid, chemistry.chemical_compound, chemistry, Diamine, education, Condensation, Organic chemistry, General Medicine, Benzene, Toluene, humanities, Catalysis
Abstract

Direct cyclocondensation of o-phenylenediamine (I) with a variety of carboxylic acids is readily achieved using catalytic amounts of boric acid in refluxing toluene under Dean-Stark conditions.

Published
2012
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3. ChemInform Abstract: Microwave-Assisted Methylation of Phenols with Tetramethylammonium Chloride in the Presence of K2CO3or Cs2CO3

Author

Marijan Kočevar, Slovenko Polanc, and Nenad Maras

Subjects
Methylating Agent, chemistry.chemical_compound, chemistry, Tetramethylammonium chloride, Organic chemistry, General Medicine, Methylation, Phenols, Toluene, Microwave assisted
Abstract

We have evaluated the potential of using tetramethylammonium chloride (Me4NCl) as an alternative methylating agent for phenols under microwave-assisted conditions. Its chemical behavior was tested in a reaction with 2-naphthol in the presence of various bases and solvents. The method was then applied in 1,2-dimethoxyethane or toluene under heterogeneous conditions for the O-methylation of a series of phenolic compounds. We found that many simple phenols can be methylated in the presence of K2CO3, whereas some other less-reactive phenols require the presence of the more reactive Cs2CO3.

Published
2009
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