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After distilling it in a vacuum, it sets to a colourless solid. It is soluble in pet ether, *benzene and slightly soluble in Et2O. [Khwaja et al. J Chem Soc (C) 2092 1970, Anschütz & Broeker Justus Liebigs Ann Chem 454 109 1927, Beilstein 6 IV 5602.]