Dehydration of Alcohols Catalysed by Heteropolyacids Supported on Silica

Abstract

Keggin type heteropolyacids supported on silica efficiently dehydrated secondary and tertiary alcohols under mild conditions and in good yields to afford the correspondent alkenes.

Influence of the Alcohol Molecular Size in the Dehydration Reaction Catalyzed by Carbon-Supported Heteropolyacids

“…The studied alcohols (1-6) are shown in figure 1, as well as alkenes (7)(8)(9)(10)(11)(12) and corresponding dimers (13)(14)(15)(16)(17)(18)(19).…”

“…However, the intensity of the maximum at 1030 cm )1 decreased considerably as a result of interaction between the precursor and surface groups of the support. ) and the products of the dehydration reaction, alkenes (7)(8)(9)(10)(11)(12) and dimers (13)(14)(15)(16)(17)(18)(19).…”

“…Highly satisfactory activity and selectivity results were observed. The dehydration reaction of other secondary as well as tertiary alcohols was also carried out [18]. On the other hand, the efficiency of silica-supported HPA catalysts in stilbene and styrene dimerization [19] and alkylation reactions [20] has been reported.…”

Silica-Supported Heteropolyacids Readily Induce Cyclodimerization of Styrenes and Stilbenes

“…[2] In some cases, it has been found that not only olefin products, but also their dimerization derivatives were obtained.…”

Liquid phase dehydration of 1-indanol: Selective synthesis of indene over microporous acid catalysts

“…To our knowledge, there are few works dealing with the 1-indanol dehydration in liquid-phase. For example, Tarlani et al [26] and E. Alesso et al [27] found that unsupported heteropolyacids catalysts were selective to the intramolecular dehydration of NOL into ENE. However, a consecutive and fast HP formation was observed on this type of catalysts and, as a consequence, a yield in indene of only 25% after 20 min was reached due to the formation of 2-(2 0 ,3 0 -dihydro-1 0 H-inden-1 0 -yl)-1H-indene.…”