Osmium silsesquioxane as model compound and homogeneous catalyst for the dihydroxylation of alkenes

Zinc Imine Polyhedral Oligomeric Silsesquioxane as a Quattro‐Site Catalyst for the Synthesis of Cyclic Carbonates from Epoxides and Low‐Pressure CO2

“…As said already, the metal sites in metal‐silsesquioxane can act as catalytic centers. A rare example of a crystallographically characterized metalated silsesquioxane‐based catalytic system is that of Maschmeyer et al., who have used silsesquioxanes as soluble models for tethered Os IV and Rh II complexes [25, 26] . Also, Ervithayasuporn et al [24] .…”

Self-Assembled Cage Structures and Ethylene Polymerization Behavior of Palladium Alkyl Complexes That Contain Phosphine-Bis(arenesulfonate) Ligands

“…Several isostructural analogues of the Li 4 S 4 O 12 core structure of 4a are known (Scheme ). Polyhedral silsesquioxanes, (RSi) 8 O 12 , which have similar cage structures linked by Si–O bonds (Scheme b), have been used as building blocks for more complex structures and as scaffolds for multicenter catalysts. , Borophosphonates of general formula [R′BO 3 PR] 4 form B–O–P-linked cubic cages (Scheme c), and analogous structures containing other group 13 metals (Al, Ga, and In) have been explored. , In addition to these tetrameric cage structures, trimeric ( t BuGa) 2 ( t Bu 2 Ga)­(O 3 P t Bu 2 )­{O 2 P­(OH) t Bu} was synthesized as a precursor to [ t BuGaO 3 P t Bu] 4 , and the hexameric aluminophosphonate cages [MeAlO 3 P t Bu] 6 and [ t BuAlO 3 PMe] 6 (Scheme d) were formed as mixtures with the corresponding [R′AlO 3 PR] 4 tetramers. , Condensation reactions of ArP­(O)­(OH) 2 (Ar = 3,5- t Bu 2 -Ph) and Ar′B­(OH) 2 (Ar′ = p -CF 3 -Ph or p -CHO-Ph) give tetrameric [Ar′BO 3 PAr] 4 cage products under dilute conditions and hexameric [Ar′BO 3 PAr] 6 products (Scheme d) under concentrated conditions, and these species interconvert in solution . In addition to cage structures, arenesulfonate–metal interactions can generate a variety of other one-, two-, and three-dimensional oligomeric and polymeric structures …”

Oxidations catalyzed by osmium compounds. Part 1: Efficient alkane oxidation with peroxides catalyzed by an olefin carbonyl osmium(0) complex

“…Surprisingly, although osmium-catalyzed oxidation reactions of olefins [63][64][65][66][67][68][69][70][71][72][73] and alcohols [74][75][76][77][78] have been reported and are used in organic synthesis, much less is known about catalysis of alkane transformations by soluble osmium compounds [79][80][81][82]. Oxide of high-valent osmium, OsO 4 [79], and osmium chlorides [80] have been used in alkane oxidations with hydrogen peroxide in organic solvents.…”