A Mn(iii)–superoxo complex of a zwitterionic calix[4]arene with an unprecedented linear end-on Mn(iii)–O2 arrangement and good catalytic performance for alkene epoxidation

Abstract

Reactions of [H(4)L][PF(6)](4) with 4 equiv. of Mn(OAc)(2)·4H(2)O in the presence of air gave rise to a mononuclear Mn(III)-superoxo complex [Mn(III)L(O(2))(H(2)O)](PF(6))(2), which contains a bowl-shaped cationic structure with a D(4d) symmetry. It has an unprecedented linear end-on Mn(III)-O(2) unit and exhibited good efficiency and selectivity in the catalytic oxidation of alkenes with O(2) plus isobutyraldehyde under mild conditions.

Dioxygen Activation by a Hexagonal SrMnO3 Perovskite Catalyst for Aerobic Liquid‐Phase Oxidation

“…Aerobic oxygenation or oxidative dehydrogenation of alkylarenes such as fluorene ( 3 c ), xanthene ( 3 d ), and 9,10‐dihydroanthracene ( 3 e ) also proceeded efficiently to give the corresponding oxygenated or dehydrogenated products (entries 3–5). Thioanisole ( 3 f ) and cyclooctene ( 3 g ) were selectively converted into the corresponding sulfoxide ( 4 f ) and epoxide ( 4 g ) in the presence of isobutyraldehyde at ambient temperature in a similar manner to that for a Mn–superoxo complex, whereas electrophilic oxidation did not proceed without the additive.…”

Optimization of Process Conditions for Styrene Epoxidation Based on the Artificial Intelligence Method

“…Epoxides are important raw materials for bulk and fine chemical industries, so the olefin epoxidations have been extensively studied [1][2][3][4][5][6][7][8]. The halo alcohol method, the epoxidation method using oxygen as an oxygen source, and the peroxide method are three common processes for styrene epoxidation.…”

Reversible Oxygenation of 2,4-Diaminobutanoic Acid-Co(II) Complexes

“…The design and synthesis of transition metal complexes with good affinity to dioxygen and long reversible oxygenation life are key to develop natural oxygen carriers. The most commonly used central metal ions are Fe(II), Cu(I), Co(II), and Mn(II) [10–16], and typical ligands include polyamine, Schiff base, amino acids, and porphyrins [14, 15, 17–19]. Certain compounds show good reversible oxygen absorbing performance in solid state [20, 21], at low temperature, or in nonaqueous media [22, 23].…”