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Fractionate it at high vacuum and recrystallise it from pentane at -80o. If too impure (cf IR), dissolve it in CH2Cl2 (ca 800mL for 100g), wash this with 2M aqueous NaOH (2 x 200mL), brine, dry, evaporate and distil it. [Craig et al. J Chem Soc, Perkin Trans 1 1949 1985, IR and NMR: Cooper J Am Chem Soc 76 3713 1954.]