NDLI: Surface intermediate species of the 4-isobutylacetophenone adsorption-reaction over fosfotungstic Wells-Dawson heteropoly acid

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Surface intermediate species of the 4-isobutylacetophenone adsorption-reaction over fosfotungstic Wells-Dawson heteropoly acid

Content Provider	Semantic Scholar
Author	Matkovic, Silvana R. Valle, Graciela M. Briand, Laura E.
Copyright Year	2009
Abstract	−− Surface adsorbed species of isobutybenzene and 4-isobutylacetophenone on bulk fosfotungstic Wells-Dawson acid H6P2W18O62.xH2O (HPA) have been screened in the present investigation. The evolution of chemisorbed species towards products was followed through infrared spectroscopy of systems containing liquid reactants and the solid acid kept at various temperatures. 4-Isobutylacetophenone adsorbs on Bronsted acid sites of the heteropoly acid and further reacts towards a condensation product similarly to the reaction of acetophenone over other acid materials such as, mordenite, niobic acid and sulfated zirconia. The condensation product possesses well defined infrared signals at 1654 cm and 1597 cm that resemble the carbonyl stretching vibration and the double bond of dypnone C6H5COHC=C(CH3)C6H5. Additional signals at 1221 cm and a shoulder at 1284 cm ascribed to the vibration of the C6H5 species in the C6H5COHC= group, give more evidences of the formation of a chalcone type compound. A reaction mechanism of the Aldol condensation of 4-isobutylacetophenone through an enol reactive intermediate is proposed. Keywords−− Aldol condensation, HPA, WellsDawson acid, chalcone, 4-isobutylacetophenone.
Starting Page	173
Ending Page	178
Page Count	6
File Format	PDF HTM / HTML
Volume Number	39
Alternate Webpage(s)	http://www.scielo.org.ar/pdf/laar/v39n2/v39n2a13.pdf
Alternate Webpage(s)	http://www.laar.uns.edu.ar/indexes/artic_v3902/Vol39_2_173.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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