Über Reinheit und polymorphe Umwandlung des Pentaerythrits

Recent Progress in Stereochemistry.

“…A decision can be reached only when we have a perfect single crystal of pentaerythritol. According to the work of Friederich and Briin (159), as well as of Ebert (160), we must assume that pentaerythritol which has been purified only by crystallization always contains an anhydride, dipentaerythritol, CioH2207, as an impurity.…”