High molecular weight polyethers synthesis

E. Vandenbergh (1) and with the mode of preparation of different active systems, polynuclear structures are clearly a key feature for the design of catalysts able to polymerize substituted oxlranes into very high molecular weight polyethers. In an exploratory approach based on these premises and aimed at the synthesis of well characterized and versatile specie of that type, we have shown indeed (2) that soluble p-oxo-bimetallic trinuclear alkoxides having the general formula RO) m1-0-m2-0-m1 (OR)0 rank cunong the best known... 

Synthesis of High Molecular Weight Polyether Polyols with Double Metal Cyanide Catalysts (DMC Catalysts)... 

Synthesis of High Molecular Weight Polyether Polyols. .. 

Catalysis with phase transfer, widely known in organic chemistry [19], was used for synthesis of LC polyethers, but it was not possible to obtain high-molecular-weight polyethers. In particular, LC polyethers were obtained with 4,4-dioxy-a-methylstilbene and a,0)-dibromoalkanes ... 

Several papers involving the synthesis of polyether-bound phosphines have been published previously. Okano et al. prepared tertiary phosphines 7 and 8 by Grignard reactions [14], and Harris et al. synthesized high-molecular-weight phosphines 9 and 10 through the functionalization of polyethylene glycols) (PEGs)... 

MW-assisted synthesis proceeded more rapidly than with conventional heating, and reaction time was reduced to 30 min with the yield of approximately 67-71% of the high-molecular-weight fraction (FP MeOH), which is more important here. Under conventional conditions this fraction was afforded in ca 10-12% yield within 30 min. Under conventional conditions similar yields of the polyethers... 

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