Enantioselective epoxidation of unfunctionalized olefins catalyzed by chiral salen Mn(III) catalyst immobilized on zirconium oligostyrenylphosphonate-phosphate

Synthesis of Sulfonic Acid-Functionalized Zirconium Poly(Styrene-Phenylvinyl-Phosphonate)-Phosphate for Heterogeneous Epoxidation of Soybean Oil

“…As the reaction time raise, the conversion rate increases gradually, but the selectivity decreases accordingly. Similar results were obtained in our earlier reports [13,20].…”

“…As the reaction time raise, the conversion rate increases gradually, but the selectivity decreases accordingly. Similar results were obtained in our earlier reports [13,20]. Note: [a] Reactions were carried out at 80 • C in 1,2-dichloroethane (5 mL) with soybean oil (10 g), TBHP (5.0 mmol), and the ZPS-PVPA-SO3H catalyst (10 mol%(wt%)); [b] conversions and selectivity were determined by GB/T1676-008 and GB/T 1677-2008 method.…”

Asymmetric epoxidation of unfactionalized olefins catalyzed by chiral salen Mn(III) immobilized onto sulfoalkyl modified zirconium poly(styrene-isopropenyl phosphonate)-phosphate and zirconium poly(styrene-phenylvinyl phosphonate)-phosphate

“…This stands in contrast to the literature reported, but the similar results have been obtained in our previous work [24].…”

Chiral salen Mn(III) immobilized on sulfoalkyl modified ZSP-IPPA as an effective catalyst for asymmetric epoxidation of unfunctionalized olefins

“…Recently, we have reported a series of organic-inorganic hybrid material as a new type of catalyst supports, include zirconium oligostyrenylphosphonate-phosphate (ZSPP) [12][13][14][15][16], zirconium poly (styrene-phenylvinylphosphonate)-phosphate (ZSP-PVPA) [17,18], and zirconium poly (styrene-isopropenyl phosphonate)-phosphate (ZPS-IPPA) [19,20]. The features of these organic-inorganic hybrids supports are different from either common polystyrene or pure zirconium phosphates.…”

“…Unfortunately, despite their excellent performance in easy separation, the heterogeneous catalysts often suffer from decreased catalytic efficiency, which is likely due to the leaching of salen Mn(III) complexes during reaction and/or the inaccessibility of the reagents to the catalytic centers [11]. Therefore, a new type and effective heterogeneous chiral salen Mn(III) catalysts is urgently needed for asymmetric epoxidation of various unfunctionalized olefins.Recently, we have reported a series of organic-inorganic hybrid material as a new type of catalyst supports, include zirconium oligostyrenylphosphonate-phosphate (ZSPP) [12][13][14][15][16], zirconium poly (styrene-phenylvinylphosphonate)-phosphate (ZSP-PVPA) [17,18], and zirconium poly (styrene-isopropenyl phosphonate)-phosphate (ZPS-IPPA) [19,20]. The features of these organic-inorganic hybrids supports are different from either common polystyrene or pure zirconium phosphates.…”