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Synthesis of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines on alumina and zirconia catalysts

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Synthesis of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines on alumina and zirconia catalysts. / Rekha, M.; Hamza, A.; Venugopal, B.R. et al.
In: Cuihua Xuebao/Chinese Journal of Catalysis, Vol. 33, No. 2-3, 28.02.2012, p. 439-446.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Rekha, M, Hamza, A, Venugopal, BR & Nagaraju, N 2012, 'Synthesis of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines on alumina and zirconia catalysts', Cuihua Xuebao/Chinese Journal of Catalysis, vol. 33, no. 2-3, pp. 439-446. https://doi.org/10.1016/S1872-2067(11)60338-0

APA

Rekha, M., Hamza, A., Venugopal, B. R., & Nagaraju, N. (2012). Synthesis of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines on alumina and zirconia catalysts. Cuihua Xuebao/Chinese Journal of Catalysis, 33(2-3), 439-446. https://doi.org/10.1016/S1872-2067(11)60338-0

Vancouver

Rekha M, Hamza A, Venugopal BR, Nagaraju N. Synthesis of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines on alumina and zirconia catalysts. Cuihua Xuebao/Chinese Journal of Catalysis. 2012 Feb 28;33(2-3):439-446. doi: 10.1016/S1872-2067(11)60338-0

Author

Rekha, M. ; Hamza, A. ; Venugopal, B.R. et al. / Synthesis of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines on alumina and zirconia catalysts. In: Cuihua Xuebao/Chinese Journal of Catalysis. 2012 ; Vol. 33, No. 2-3. pp. 439-446.

Bibtex

@article{db737342f19a460aa41ab4657022f769,
title = "Synthesis of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines on alumina and zirconia catalysts",
abstract = "In this study, alumina, zirconia, manganese oxide/alumina, and manganese oxide/zirconia have been investigated for their catalytic activity in the condensation reaction between o-phenylenediamine and an aldehyde or a ketone to synthesise 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines respectively. Surface area, surface acidity, and morphology of the catalysts have been analysed and correlated with their catalytic activity. The isolated yields of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines are in the range of 30% to 95%. A good correlation between the amount of surface acid sites as well as the surface morphology of the catalysts and the catalytic activity has been observed. This method has been found to be simple and economical. The solid supports could be regenerated and reused without much loss in their activity. Further, the solid supports have been also found to be effective as general catalysts in the condensation of o-phenylenediamine with other substituted aldehydes and ketones.",
keywords = "2-substituted benzimidazoles, 1,5-disubstituted benzodiazepines, manganese oxide, alumina, zirconia",
author = "M. Rekha and A. Hamza and B.R. Venugopal and N. Nagaraju",
year = "2012",
month = feb,
day = "28",
doi = "10.1016/S1872-2067(11)60338-0",
language = "English",
volume = "33",
pages = "439--446",
journal = "Cuihua Xuebao/Chinese Journal of Catalysis",
issn = "0253-9837",
publisher = "Science Press",
number = "2-3",

}

RIS

TY - JOUR

T1 - Synthesis of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines on alumina and zirconia catalysts

AU - Rekha, M.

AU - Hamza, A.

AU - Venugopal, B.R.

AU - Nagaraju, N.

PY - 2012/2/28

Y1 - 2012/2/28

N2 - In this study, alumina, zirconia, manganese oxide/alumina, and manganese oxide/zirconia have been investigated for their catalytic activity in the condensation reaction between o-phenylenediamine and an aldehyde or a ketone to synthesise 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines respectively. Surface area, surface acidity, and morphology of the catalysts have been analysed and correlated with their catalytic activity. The isolated yields of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines are in the range of 30% to 95%. A good correlation between the amount of surface acid sites as well as the surface morphology of the catalysts and the catalytic activity has been observed. This method has been found to be simple and economical. The solid supports could be regenerated and reused without much loss in their activity. Further, the solid supports have been also found to be effective as general catalysts in the condensation of o-phenylenediamine with other substituted aldehydes and ketones.

AB - In this study, alumina, zirconia, manganese oxide/alumina, and manganese oxide/zirconia have been investigated for their catalytic activity in the condensation reaction between o-phenylenediamine and an aldehyde or a ketone to synthesise 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines respectively. Surface area, surface acidity, and morphology of the catalysts have been analysed and correlated with their catalytic activity. The isolated yields of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines are in the range of 30% to 95%. A good correlation between the amount of surface acid sites as well as the surface morphology of the catalysts and the catalytic activity has been observed. This method has been found to be simple and economical. The solid supports could be regenerated and reused without much loss in their activity. Further, the solid supports have been also found to be effective as general catalysts in the condensation of o-phenylenediamine with other substituted aldehydes and ketones.

KW - 2-substituted benzimidazoles

KW - 1,5-disubstituted benzodiazepines

KW - manganese oxide

KW - alumina

KW - zirconia

U2 - 10.1016/S1872-2067(11)60338-0

DO - 10.1016/S1872-2067(11)60338-0

M3 - Journal article

VL - 33

SP - 439

EP - 446

JO - Cuihua Xuebao/Chinese Journal of Catalysis

JF - Cuihua Xuebao/Chinese Journal of Catalysis

SN - 0253-9837

IS - 2-3

ER -