Acid-Base Interaction on Solid Surface

Control of Acid-Base Interaction on Solid Surface 

To more precisely control the acid-base interaction of the silica-alumina-supported tertiary amine catalyst for organic synthesis, we examined the control of the density of surface Si-OH groups [15]. According to the above-mentioned immobilization mechanism, if the Si-OH density decreases, the acid-base interaction should be decease because of the far amine-immobilization positions from strong acid sites, resulting in lower acid-base interaction and higher catalytic performance. 

Silica-alumina was pretreated at 120-500 °C under vacuum before using it as a support for amines. The treated samples are denoted as SA (treatment temperature, T). Tertiary amines were immobihzed on the SA(T) by treating 

4-addition reaction of nitroethane to methyl vinyl ketone was examined using SA(T)-NEt2. Results are summarized in Table 1.7. The catalyst 

Entry Catalyst Conversion of nitroethane (%) Yield of dialkylated product (%) Initial rate (mmol h )  

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