933964-60-4Relevant academic research and scientific papers
Novel Approach to Benzimidazoles Using Fe3O4 Nanoparticles as a Magnetically Recoverable Catalyst
Karami, Bahador,Nikoseresht, Shaghayegh,Khodabakhshi, Saeed
, p. 298 - 301 (2012)
Magnetically recoverable Fe3O4 nanoparticles have been synthesized as a catalyst for the cyclocondensation of 1,2-phenylenediamines with orthoesters under solvent-free conditions. Catalyst loadings can be as low as 1 mol% to give high yields of the corresponding benzimidazole derivative at 80 °C. This green method offers significant advantages in terms of its simplicity, low catalyst loadings, high product yields, and non-toxic nature. The Fe3O4 nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy.
A rapid access to novel and known benzimidazole derivatives using silica chloride as a reusable catalyst
Karami, Bahador,Ghashghaee, Vahideh,Khodabakhshi, Saeed
experimental part, p. 959 - 964 (2012/05/31)
A new application of silica chloride as an easily available and reusable solid acid catalyst for the synthesis of benzimidazole and its derivatives through the condensation of o-phenylenediamines and orthoesters under thermal and solvent-free conditions is described. This novel and eco-friendly method is very cheap and has many advantages including excellent yields, short reaction time, and simple work-up procedure. Copyright
Novel approach to benzimidazoles using Fe3O4 nanoparticles as a magnetically recoverable catalyst
Karami, Bahador,Nikoseresht, Shaghayegh,Khodabakhshi, Saeed
experimental part, p. 298 - 301 (2012/06/29)
Magnetically recoverable Fe3O4 nanoparticles have been synthesized as a catalyst for the cyclocondensation of 1,2- phenylenediamines with orthoesters under solvent-free conditions. Catalyst loadings can be as low as 1 mol to give high yields of the corresponding benzimidazole derivative at 80°C. This green method offers significant advantages in terms of its simplicity, low catalyst loadings, high product yields, and non-toxic nature. The Fe3O4 nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy.
Tungstate sulfuric acid: Preparation, characterization, and application in catalytic synthesis of novel benzimidazoles
Karami, Bahador,Khodabakhshi, Saeed,Haghighijou, Zahra
, p. 684 - 690 (2013/07/26)
Tungstate sulfuric acid (TSA) was prepared, characterized, and applied for direct synthesis of novel and known benzimidazoles through a condensation reaction of o-phenylenediamines with orthoesters under solvent-free conditions. TSA was characterized by powdered X-ray diffraction (XRD), X-ray fluorescence (XRF), and FTIR spectroscopy. This novel and eco-friendly method is very cheap and has many advantages such as excellent yields, recyclable and eco-friendly catalyst, and simple work-up procedure.
Novel silica tungstic acid (STA): Preparation, characterization and its first catalytic application in synthesis of new benzimidazoles
Karami, Bahador,Ghashghaee, Vahideh,Khodabakhshi, Saeed
experimental part, p. 71 - 75 (2012/06/16)
A novel silica tungstic acid (STA) as a highly efficient catalyst has been synthesized and employed for the cyclocondensation of 1,2-phenylenediamines with orthoesters under solvent-free conditions. Catalyst loadings can be as low as 1 mol% to give high yields of the corresponding benzimidazoles at 80 °C. To make the catalyst, sodium tungstate reacted with silica chloride under refluxing n-hexane. The STA as a novel solid acid was characterized by X-ray fluorescence, X-ray diffraction, and Fourier transform infrared spectroscopy.
Microwave-assisted synthesis of polysubstituted benzimidazoles by heterogeneous Pd-catalyzed oxidative C-H activation of tertiary amines
De Luca, Lidia,Porcheddu, Andrea
supporting information; experimental part, p. 5791 - 5795 (2011/11/06)
Tertiary amines can be used in place of aldehydes and carboxylic derivatives as partners in the synthesis of benzimidazoles. Dehydrogenative amine activation under heterogeneous catalysis was developed for the direct transformation of tertiary amines into benzimidazoles. Good yields and efficient recovery and recycling of the catalyst are some of the advantages of this new methodology, which shows that a simple alkene is used as the overall oxidative agent. Enhanced reaction rates were observed by using focused microwave heating.
