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- W2079872065 abstract "Copolymerization of ethylphenylketene with benzaldehyde by butyllithium proceeded in a perfect 1:1 alternating manner to afford the corresponding polyester, of which the repeating unit has two adjacent chiral centers. The relative stereochemistry between these two chiral centers was controlled by solvents (tetrahydrofuran or toluene) and additives such as (−)-sparteine or diethylzinc, and the resulting diastereoselectivity, erythro-configuration:threo-configuration, was controlled in a range of 80:20 to 12:88. These diastereomeric ratios were determined by HPLC analysis of the diols, which were obtained by reductive degradation of the polyester with maintaining the configuration of the repeating unit. The more polar diol was converted to the corresponding cyclic carbonate, and a single crystal of it was successfully analyzed by X-ray crystallography to determine its configuration as a threo one. The threo-rich polymer was less soluble, more thermally degradable, and denser than the erythro-rich polymer." @default.
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- W2079872065 date "2003-04-08" @default.
- W2079872065 modified "2023-10-14" @default.
- W2079872065 title "Alternating Copolymerization of Ethylphenylketene with Benzaldehyde: Solvent- and Additive-Controlled Stereospecific Formation of Polyester" @default.
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- W2079872065 doi "https://doi.org/10.1021/ma021423j" @default.
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