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http://pubs.acs.org/doi/suppl/10.1021/ja2111543 KO2-based Reactions Tetraethylene glycol dimethyl ether (TEGDME, Aldrich), and propylene carbonate (PC, Aldrich) were distilled and placed over activated 4A molecular sieves prior to use. Karl-Fischer titration determined a final water content of < 20 ppm. All experiments were conducted in an Arfilled glove box with < 0.5 ppm H2O and <1 ppm O2. KO2 and 18-crown-6 (crown ether) (SigmaAldrich) were added (1:1 molar ratio) to 5 ml of TEGDME and were stirred for 12 hours to ensure complete chelation of the KO2 by the crown ether. A 1 M solution of LiPF6 in TEGDME was added in a 2:1 molar ratio with KO2 to form the lithiated oxide, LiO2. |
7Â¥2013-04-17 08:16:45
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