Isomerisation of α-pinene oxide over silica supported heteropoly acid H3PW12O40

Catalytic Chemistry of Supported Heteropolyacids and Their Applications as Solid Acids to Industrial Processes

“…Table 1 summarizes recent studies on acidcatalyzed reactions over supported HPA catalysts reported in 2001 or after [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. The examples before 2001 are provided in other review articles [1,3,48].…”

“…The examples before 2001 are provided in other review articles [1,3,48]. For the liquidphase reactions in polar solvent, catalyst deactivation due to leaching of HPA would be a problem, but in most reactions in Table 1, catalyst deactivation was very little [39,44,46] or if any, the catalysts were reusable at least several times [34,35,37,39,41,43,45,47].…”

Isomerization of styrene oxide to phenylacetaldehyde over supported phosphotungstic heteropoly acid

“…[8]. Previously, we have reported HPAs to be versatile catalysts for isomerization of various compounds, e.g., ␣-pinene oxide [9,10].…”

Heteropoly acid catalyzed cyclization of nerolidol and farnesol: Synthesis of α-bisabolol

“…Previously, we have applied HPA catalysts in a variety of liquidphase reactions of terpenic compounds, such as isomerization [28][29][30][31][32], hydration, etherification and esterification [33][34][35], and cycloaddition [36]. Within our program on the valorization of natural ingredients of essential oils by catalytic transformations, we report now the application of tungstophosphoric heteropoly acid H 3 PW 12 O 40 (HPW), the strongest HPA in the Keggin series, as a homogeneous catalyst for the isomerization of nerolidol (1) and farnesol (2) aiming to obtain ␣-bisabolol (3).…”