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Titolo:
Solvent effects in the liquid phase Beckmann rearrangement of 4-hydroxyacetophenone oxime over H-Beta catalyst
Autore:
Chung, YM; Rhee, HK;
Indirizzi:
Seoul Natl Univ, Sch Chem Engn, Kwanak Ku, Seoul 151742, South Korea SeoulNatl Univ Seoul South Korea 151742 k Ku, Seoul 151742, South Korea Seoul Natl Univ, Inst Chem Proc, Kwanak Ku, Seoul 151742, South Korea Seoul Natl Univ Seoul South Korea 151742 k Ku, Seoul 151742, South Korea
Titolo Testata:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
fascicolo: 2, volume: 159, anno: 2000,
pagine: 389 - 396
SICI:
1381-1169(20001002)159:2<389:SEITLP>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
CYCLOHEXANONE OXIME; ACTIVE-SITES; GAS-PHASE; ZEOLITES;
Keywords:
Beckmann rearrangement; acetaminophen; Zeolite Beta; adsorption; solvent effect;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Rhee, HK Seoul Natl Univ, Sch Chem Engn, Kwanak Ku, Seoul 151742, South Korea Seoul Natl Univ Seoul South Korea 151742 ul 151742, South Korea
Citazione:
Y.M. Chung e H.K. Rhee, "Solvent effects in the liquid phase Beckmann rearrangement of 4-hydroxyacetophenone oxime over H-Beta catalyst", J MOL CAT A, 159(2), 2000, pp. 389-396

Abstract

N-acetyl-para-aminophenol (APAP) or acetaminophen was first synthesized via the environmentally benign liquid phase Beckmann rearrangement of 4-hydroxyacetophenone oxime over zeolite H-Beta. The reaction represents a typicalcase of active solvent participation. The results of co-adsorption of substrate and solvent suggest that the facility of protonation of oxime is mainly dependent upon the competitive adsorption between substrate and solvent. On the other hand, a solvent having a higher dielectric constant or more polar nature is preferred in the subsequent 1,2-H-shift and rearrangement steps. Consequently, the choice of a suitable solvent balancing between the two competitive aspects is the most important factor enhancing the performance of the reaction. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 18/11/17 alle ore 05:52:08