Advances in Homogeneous and Heterogeneous Catalytic Asymmetric Epoxidation

Manganese coordination chemistry of bis(imino)phenoxide derived [2 + 2] Schiff-base macrocyclic ligands

“…[6] We note that a number of dinuclear manganese complexes are of catalytic interest given their potential for catecholase activity, [7] whilst manganese Schiff-base complexes have also attracted attention for their antibacterial properties, [8] and have also been extensively employed in organic chemistry, for example as catalysts for asymmetric epoxidation. [9] As mentioned above, our interest stems from exploring the use of earth abundant transition metals as the metal centres in pre-catalysts for ROP, and herein, we have screened the manganese complexes for their ability to act as pre-catalysts in the ring opening polymerization (ROP) of ε-caprolactone; there is a lack of other Mn-based systems utilized in ROP of cyclic esters. [10] (1) was isolated in moderate yield (ca.…”

Recent developments in enantioselective lanthanide-catalyzed transformations

“…Chiral epoxides constitute key building blocks for the synthesis of a wide range of important products [55]. In particular, the asymmetric epoxidation of a,b-unsaturated carbonyl compounds is an important and challenging transformation in organic synthesis [56].…”

Co2+-exchanged SAPO-5 and SAPO-34 as efficient heterogeneous catalysts for aerobic epoxidation of alkenes

“…The selective oxidation of alkenes is of significant importance in the fine chemicals and pharmaceutical industries, since epoxides are key building blocks in organic synthesis [1][2][3]. Traditionally, epoxides are produced by the epoxidation of alkenes with stoichiometric amount of peracid as oxidant, which is hazardous and environmentally undesirable.…”

“…Due to the inherent advantages of heterogeneous catalysts over homogeneous ones, a number of solid catalysts have been developed [21]. Simple transition metal oxides like NiO, CoOx, MoO 3 and CuO show high activities for the selective epoxidation of styrene to styrene oxide [22]. Sulfated Y-ZrO 2 is as well active for the epoxidation of styrene with molecular oxygen [23].…”