Novel polymer-supported ruthenium and iron complexes that catalyze the conversion of epoxides into diols or diol mono-ethers: clean and recyclable catalysts

Recent Applications of Polymer Supported Organometallic Catalysts in Organic Synthesis

“…Ring opening of epoxides using a supported cobalt catalyst has been described earlier in this review (see Section 2.1 ), but the same reaction can also be carried out with ruthenium catalysis, as demonstrated by Kim and Lee [ 30 ]. A ruthenium(III) complex was anchored to a polymer-bound bis(2-picolyl)amine ligand and applied in the reaction of both aromatic and aliphatic epoxides with either methanol or water with essentially complete conversion ( Scheme 10 ).…”

Metal-directed assembly of metal(II) benzoates (M = Mn, Ni, Co, Cu, Zn, and Cd) with 1,2-bis(4-pyridyl)ethene: Light- and photo-induced [2 + 2] cycloaddition

“…Based on present and previous results, we suggest that the nature of metals plays an important role to perform the specific reactions [35][36][37][38][39][40][41][42]. Moreover, it is possible to tune the catalytic activities by changing from Zn to those metals such as Cu and Mn.…”

Cross‐linked poly(N‐vinylpyrrolidone)‐titanium tetrachloride complex: A novel stable solid TiCl4 equivalent as a recyclable polymeric Lewis acid catalyst for regioselective ring‐opening alcoholysis of epoxides

“…Some heterogeneous catalysts by immobilizing the homogeneous counterparts onto traditional solid supports such as polymer, cross‐linked poly (styrene‐co‐4‐vinylpyridine), metal–organic framework (MOF), aluminosilicate or mesoporous silica, polyacrylonitrile fiber have been developed for this transformation. [ 27–39 ] However, despite these significant advances and merits of their relevant catalysts, some of these protocols suffer from one or more limitations such as the use of catalysts with less capacity and low activity, low swelling in reaction media, long reaction times, the leaching issue of active species, and the use of expensive and hazardous catalysts. Given this perspective, the development of a new method for the cleaner ring opening alcoholysis of epoxides is still required.…”