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Check the IR for the presence of OH str vibrations; if so then wash it well with H2O, dry it with CaCl2 and distil it through a good fractionating column. The liquid is an irritant. [Watanabe et al. J Org Chem 23 1666 1958, Schueler & Hanna J Am Chem Soc 73 3528 1951, Beilstein 1 IV 2084.]