Reactions of polypeptide esters in the solid state, II. A few cases of prevailing polycondensation. Remarks concerning the reaction mechanism

When tetraglycine methyl ester is heated at 185° C in the solid state or at 100° C dissolved in methanol, polymers containing small amounts of sarcosyl‐units are formed. An induction period occurs only under the first mentioned conditions. Also polymers obtained by heating triglycine methyl ester at 100°–100° C partly consisted of sarcosyl‐units. Some of the phenomena described in this and the preceding part1) are believed to be due to rigidity of the crystal lattice.