Thermal Synthesis of Polypeptides from N-Butyloxycarbonyl Oligopeptides Containing Aspartyl Residue at C-Terminus

Figure 13

IR spectra of the lower molecular weight fractions obtained from Boc-Gly-Gly-L-Asp (A) at 120°C for 4 h and Boc-L-Val-L-Asp (B) at 130°C for 2 h in the reaction heating reactions.