Abstract
► 1 H and 13 C NMR data for four semisynthetic sesquiterpene lactones. ► Full assignment of NMR data, including chemical shift and constant couplings. ► NOE, constant couplings and theoretical calculations to determine stereochemistry. In this work is described a complete 1 H and 13 C NMR analysis for a group of four sesquiterpene lactones, three previously unknown. The unequivocal assignments were achieved by 1 H NMR, 13 C{ 1 H} NMR, J-resolved , gCOSY, gHMQC, gHMBC and NOESY experiments and no ambiguities were left behind. All hydrogen coupling constants were measured, clarifying all hydrogen signals multiplicities.
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