Monocrotalic acid (IIIa) is shown to have the absolute configuration (2R,3R,4R). Trichodesmic acid (IIIc), previously assigned the (2R,3R,4R)- or (2S,3S,4S)-configuration is shown to have the same chirality at the asymmetric centres as monocrotalic acid.
D. J. Robins and D. H. G. Crout, J. Chem. Soc. C, 1969, 1386 DOI: 10.1039/J39690001386
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