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Dichloromethane (methylene dichloride) [75-09-2] M 84.9, b 40.0¡ã, d 1.325, n 1.42456, n251.4201. Shaken with portions of cone H2SO4 until the acid layer remained colourless, then washed with water, aqueous 5% Na2CO3, NaHCO3 or NaOH, then water again. Pre-dried with CaCl2, and distd from CaSO4, CaH2 or P2O5. Stored away from bright light in a brown bottle with Linde type 4A molecular sieves, in an atmosphere of dry N2- Other purification steps include washing with aq Na2S2O3, passage through a column of silica gel, and removal of carbonyl-containing impurities as described under Chloroform. It has also been purified by treatment with basic alumina, distd, and stored over molecular sieves under nitrogen [Puchot et al. J Am Chem Soc 108 2353 7956].
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