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Volumn , Issue 19, 2005, Pages 2927-2930

Layered zirconium sulfophenyl phosphonate as heterogeneous catalyst in the synthesis of pyrazoles and 4,5,6,7-tetrahydro-1(2)H-indazoles

Author keywords

Heterogeneous catalysis; Indazoles; Pyrazoles; Solvent free reactions; Zirconium sulfophenyl phosphonate

Indexed keywords

4,5,6,7 TETRAHYDRO 1(2H) INDAZOLE DERIVATIVE; HYDRAZINE DERIVATIVE; INDAZOLE DERIVATIVE; PYRAZOLE DERIVATIVE; SOLVENT; UNCLASSIFIED DRUG; ZIRCONIUM DERIVATIVE; ZIRCONIUM SULFOPHENYL PHOSPHONATE;

EID: 28844481893     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2005-921904     Document Type: Article
Times cited : (58)

References (21)
  • 1
    • 0031010928 scopus 로고    scopus 로고
    • references cited therein
    • Kabalka, G. W.; Pagni, R. M. Tetrahedron 1997, 53, 7999; and references cited therein.
    • (1997) Tetrahedron , vol.53 , pp. 7999
    • Kabalka, G.W.1    Pagni, R.M.2
  • 2
    • 0000559096 scopus 로고
    • Measurement of the acid strength: 0.5 g of zirconium sulfophenyl phosphonate, previously dried at 160 °C for 12 h, were dispersed in 3 mL of benzene in a test tube. Then, 0.2 mg of the chosen Hammet indicator were added to the dispersion held under stirring. The colour changes were evaluated after 30 min
    • Measurement of the acid strength: 0.5 g of zirconium sulfophenyl phosphonate, previously dried at 160 °C for 12 h, were dispersed in 3 mL of benzene in a test tube. Then, 0.2 mg of the chosen Hammet indicator were added to the dispersion held under stirring. The colour changes were evaluated after 30 min. For more detailed information see: (a) Umansky, B.; Engelhardt, J.; Hall, W. K. J. Catal. 1991, 727, 128.
    • (1991) J. Catal. , vol.727 , pp. 128
    • Umansky, B.1    Engelhardt, J.2    Hall, W.K.3
  • 9
    • 84944033746 scopus 로고    scopus 로고
    • Katrizky, A. R.; Rees, C. W.; Scriven, E. F. V., Eds.; Pergamon Press: Oxford
    • (a) Elguero, J. In Comprehensive Heterocyclic Chemistry, Vol. 3; Katrizky, A. R.; Rees, C. W.; Scriven, E. F. V., Eds.; Pergamon Press: Oxford, 1996, 1-75.
    • (1996) Comprehensive Heterocyclic Chemistry , vol.3 , pp. 1-75
    • Elguero, J.1
  • 13
    • 28844448144 scopus 로고    scopus 로고
    • note
    • 3): δ = 10.2, 20.4, 23.0 (double), 23.3,117.7,121.0,127.2,128.8, 135.7,138.3, 145.2, 145.6, 153.5. GCMS: m/z = 302, 285, 255, 209, 181, 135, 115.
  • 20
    • 28844455915 scopus 로고    scopus 로고
    • note
    • 2 and dried at 120 °C for 12 h can be reused for several experiments. The reaction of 2,3-hexanedione and phenylhydrazine has been repeated 3 times with the following yields: 82% (2 h), 84% (2 h), 79% (2 h).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.