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Angewandte Chemie - International Edition
Volumn 46, Issue 21, 2007, Pages 3922-3925
A tungsten-tin mixed hydroxide as an efficient heterogeneous catalyst for dehydration of aldoximes to nitriles
Author keywords

Dehydration; Heterogeneous catalysis; Nitriles; Tin; Tungsten
Indexed keywords

ALDEHYDES; AMINES; COPRECIPITATION; DEHYDRATION; TIN OXIDES; TUNGSTEN COMPOUNDS;
EID: 34250702224     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.200605004     Document Type: Article
Times cited : (185)
References (33)
  • 8
  • 19
    • 34250774434 scopus 로고    scopus 로고
    • Three kinds of W-Sn hydroxide catalysts with different Sn/W molar ratios (0.9, 1.9, and 5.2) were prepared and used for the dehydration of benzaldoxime. The W-Sn hydroxide with the Sn/W molar ratio of 1.9 showed the highest catalytic activity, and the order of reactivity was as follows: Sn/W = 1.9(79) > 5.2(9) > 0.9(7), where the values in the parentheses are the percent conversion of benzaldoxime under the conditions given in Table 1.
    • Three kinds of W-Sn hydroxide catalysts with different Sn/W molar ratios (0.9, 1.9, and 5.2) were prepared and used for the dehydration of benzaldoxime. The W-Sn hydroxide with the Sn/W molar ratio of 1.9 showed the highest catalytic activity, and the order of reactivity was as follows: Sn/W = 1.9(79) > 5.2(9) > 0.9(7), where the values in the parentheses are the percent conversion of benzaldoxime under the conditions given in Table 1.
  • 21
    • 1642373806 scopus 로고
    • and references therein
    • A. Corma, Chem. Rev. 1995, 95, 559, and references therein.
    • (1995) Chem. Rev , vol.95 , pp. 559
    • Corma, A.1
  • 22
    • 34250707923 scopus 로고    scopus 로고
    • It was confirmed by an IR spectrum of pyridine adsorbed on the W-Sn hydroxide (Figure S2 in the Supporting Information) that the quantities of Lewis and Brønsted acid sites were 0.34 and 0.17 mmol g-1, respectively, and lower than those of zeolites such as H-mordenite and H-Y (Figure S3 in the Supporting Information, 18] The IR spectrum was also recorded after the pretreatment of the W-Sn hydroxide (evacuated at 150°C for 3 h, see the Experimental Section, The acidity of the W-Sn hydroxide became much stronger by the pretreatment; the H0 value of the pretreated sample lay between -5.6 and -8.2. However, the reaction rate of benzaldoxime dehydration with the pretreated catalyst (R, 1.8 mM min-1 under the conditions in Table 1) was lower than that with the as-prepared catalyst 8.7 mM min-1, This result is consistent with the fact that catalysts with strong acidity, such as zeolites and
    • -1). This result is consistent with the fact that catalysts with strong acidity, such as zeolites and solid superacids, are not effective for the present dehydration.
  • 31
    • 0036215638 scopus 로고    scopus 로고
    • 3+ sites) in zeolites (See Table S3 in the Supporting Information) while Das and co-workers have reported that H-Y zeolite was active for the direct synthesis of nitriles from hydroxylamine and aldehydes; see: K. V. N. S. Srinivas, E. B. Reddy, B. Das, Synlett 2002, 625.
    • 3+ sites) in zeolites (See Table S3 in the Supporting Information) while Das and co-workers have reported that H-Y zeolite was active for the direct synthesis of nitriles from hydroxylamine and aldehydes; see: K. V. N. S. Srinivas, E. B. Reddy, B. Das, Synlett 2002, 625.
  • 32
    • 84973339075 scopus 로고    scopus 로고
    • 82nd ed, Ed, D. R. Lida, CRC Press, Washington DC, sec. 10, p
    • a) G. P. Williams in CRC Handbook of Chemistry and Physics, 82nd ed. (Ed.: D. R. Lida), CRC Press, Washington DC, 2001, sec. 10, p. 200-205;
    • (2001) CRC Handbook of Chemistry and Physics , pp. 200-205
    • Williams, G.P.1

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.