Acid-Base Catalysis II: Proceedings of the International by Hideshi Hattori, Makoto Misono, Yoshio Ono

By Hideshi Hattori, Makoto Misono, Yoshio Ono

Good acid catalysts are already getting used in numerous approaches in petroleum refining and are almost immediately being studied intensively in either educational and utilized fields for utilization in a number of reactions. stable base catalysts also are gaining expanding reputation as capability catalysts. either acidic and simple catalysts are promising not just with admire to acid and base-catalysed reactions but in addition in fabrics sciences, comparable to the construction of adsorbents, sensors, ceramics, and so forth. the current quantity includes the textual content of 21 invited oral displays and fifty eight poster displays. the fabric covers a variety of points on acid-base catalysis, from quantum chemistry to industrialised strategies.

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By Hideshi Hattori, Makoto Misono, Yoshio Ono

Good acid catalysts are already getting used in numerous approaches in petroleum refining and are almost immediately being studied intensively in either educational and utilized fields for utilization in a number of reactions. stable base catalysts also are gaining expanding reputation as capability catalysts. either acidic and simple catalysts are promising not just with admire to acid and base-catalysed reactions but in addition in fabrics sciences, comparable to the construction of adsorbents, sensors, ceramics, and so forth. the current quantity includes the textual content of 21 invited oral displays and fifty eight poster displays. the fabric covers a variety of points on acid-base catalysis, from quantum chemistry to industrialised strategies.

Show description

Read Online or Download Acid-Base Catalysis II: Proceedings of the International Symposium on Acid-Base Catalysis Ii, Sapporo, December 2-4, 1993 PDF

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Acid-Base Catalysis II: Proceedings of the International Symposium on Acid-Base Catalysis Ii, Sapporo, December 2-4, 1993

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Additional info for Acid-Base Catalysis II: Proceedings of the International Symposium on Acid-Base Catalysis Ii, Sapporo, December 2-4, 1993

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5 74 PhCH=C(CN)2 CH&N 3 86 PhCH=C(CN)Ph DME 21 82 DME 15 55 Benzene 21 82b) PhCHCHZCOPh I Yield/%') CH2N02 + CHz(CN)z + PhCH2CN PhCHO PhCHO 0 PhCHO 0 + CH,(CN), + PhCHClCN ()=C(CN), a) Isolated yields after purification. b) Yield determined by 'H-NMR. 12 T. A N D 0 usually obtained better yields under milder conditions than with the conventional base catalysts. Some of the reactions including the Knoevenagel, Darzens, and Wittig-Horner reactions were carried out by the flow method using a column packed with KF-alumina [131.

IW-CELITE AND IW-ALUMINAAS SOLID BASES Fluoride salts are important as fluorination reagents because of the importance of fluorinated organic compounds. Although fluoride salts are neutral in water, it has been known that they behave as basic catalysts in several reactions. 9 10 T. A N D 0 In 1977 Clark and Miller proposed an interesting idea of hydrogen-bond-assisted reactions as shown in Eq. 1[41. + [ F - - -H-ZR'] 7 R-X P - + R'ZR ( 11 HFX The idea originates from the strong hydrogen bond between the fluoride anion and a protic compound HZR as a result of the large electron density of the small fluoride anion.

02 mmol, benzene reflux 2 h. b) Treated in an autoclave, the recovered catalyst was calcined at 300 "C for 3 h prior to reuse for benzylation. 2 Hydrolysis of Ethyl Acetate As shown in Table 4, water-insoluble acidic heteropolytungstates, Cs~,Ho,PW,O, and Cs 5H1,5SiW12040, exhibited higher catalytic activity than a comparative inorganic solid acid of H-%SM-5 in terms of specific rate per unit catalyst weight and turnover frequency for the hydrolysis of ethyl acetate and the esterification of acetic acid with ethanol in the liquid phase.

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