| http://www.w3.org/ns/prov#value | - A further purification of the 9-(dioxaborolan-2-yl)perylene-3,4-dicarboximide IVa and/or 3,9- or 3,10-bis(dioxaborolan-2-yl)perylene IXb which is isolated here too by filtering off the solid constituents and distilling off the solvent is typically again not required, but may likewise be effected by washing with a solvent which dissolves the impurities, such as water, or by column chromatography on
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