✦ LIBER ✦
Polycondensation of L-Lysine Diketopiperazine with Tartaric Acid - Evidence on the Formation of Cyclic Oligomers
✍ Scribed by Maria Antònia Majó; Jordi J. Bou; Concepción Herranz; Sebastián Muñoz-Guerra
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 158 KB
- Volume
- 207
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
Summary: Reaction of active esters of O‐protected D‐and L‐tartaric acid with L‐lysine 2,5‐diketopiperazine afforded optically active low molecular weight compounds with T~g~ ≈ 130 °C. ^13^C NMR results indicated that the condensation product consisted of cyclic oligomers made from 1 to 6 repeating units. Mass spectrometric analysis by MALDI‐TOF ascertained such interpretation and suggested a revision of previous work reporting on polymerization of 2,5‐diketopiperazines.
MALDI‐TOF profile of __c__KT‐LL.
magnified imageMALDI‐TOF profile of __c__KT‐LL.