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- W6060176 abstract "UV-Vis diffuse-reflectance spectroscopy has been employed to study the reaction of acetone and acetaldehyde alone on three basic substances, MgO and two hydrotalcite samples with different CO32−/Cl− ratio. Aldolic condensation followed by dehydration takes place, leading to carbonylic polyenic species, with electronic transitions in the UV-Vis. So far, formation of mesityl oxide and phorone from acetone had been documented. The spectroscopic technique affords evidence about the presence on the surface of species involving up to five acetone units and probably more than eight in the case of acetaldehyde. The order of activity is: C!−-rich hydrotalcite <Cl−-poor hydrotalcite <MgO: the effect of thermal pretreatment has also been studied. On MgO dehydrated only at 270°C, a second reaction takes place with acetaldehyde, possibly consisting in a Cannizzaro disproportionation. The frequency of the π −>π* transitions in the reaction products is observed to differ somewhat from solid to solid, and from the values in solution, because of a “solvent” effect exerted by the solids." @default.
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- W6060176 date "1994-01-01" @default.
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- W6060176 title "2.11 UV-Vis Study of the Condensation Reaction of Carbonylic Compounds on MgO and Hydrotalcites" @default.
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- W6060176 doi "https://doi.org/10.1016/s0167-2991(08)61818-2" @default.
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