Untersuchungen in der Inden‐Reihe. III.: β‐Amino‐β‐methyl‐hydrinden aus o‐Xylylencyanid

A Carbon-14 Isotope Effect Study of the Dieckmann Condensation of Diethyl Phenylenediacetate1,2

“…The nitrile was hydrolyzed to phenylenediacetic-l-C14 acid by heating with coned, hydrochloric acid. 26 The acid was exhaustively purified by partition between ether and sodium hydroxide solution, by activated charcoal treatments, and by repeated recrystallizations alternately from water and from ether-petroleum ether mixture. The pure phenylenediacetic-l-C14 acid melted at 150-1.510; the reported m.p.…”