Aminyloxide (nitroxide)—XXIV

SBA‐15‐Functionalized 3‐Oxo‐ABNO as Recyclable Catalyst for Aerobic Oxidation of Alcohols under Metal‐Free Conditions

“…[20] In a first step, the SBA-15 was obtained by treating Pluronic P123 and (EtO) 4 Si under acidic conditions. The resulting SBA-15 was then functionalized using (3-aminopropyl) triethoxysilane (APS) followed by reductive amination with 3-oxo-ABNO in methanol to afford the corresponding SBA-15-supported 3-oxo-ABNO, which was denoted as SABNO (Scheme 3).…”

“…[1] In this context, various oxidizing agents have been reported such as stoichiometric Cr VI salts, [2] DMSO-coupled reagents, [3] and hypervalent iodine; [4] however, most of them are toxic and give rise to hazardous wastes. On the other hand, many metalbased catalysts are sometimes environmentally harmful and leave toxic traces of heavy metals or are deactivated.…”

Acyl nitroxides

“…(7a) (Tb) (7c) [13], which is greater than that found in dialkyl nitroxides, although some spin is found on carbonyl oxygen [14]. For purposes of comparison with the X-ray results, MNDO bond lengths are included in Figure 2; the calculations give a coplanar energy minimum with oxygen atoms "trans".…”

A Highly Recyclable Magnetic Core‐Shell Nanoparticle‐Supported TEMPO catalyst for Efficient Metal‐ and Halogen‐Free Aerobic Oxidation of Alcohols in Water

“…[1] Many oxidizing reagents such as stoichiometric Cr VI salts, [2] DMSOcoupled reagents, [3] and hypervalent iodine [4] have been traditionally used to accomplish this transformation. However, these reagents show poor atom efficiency and are often toxic; their widespread use thereby causes significant environmental concerns that render them impractical.…”