2,2-Dimethyl-5-[(5E)-5-methyl-6-pyrrol-2-ylhexa-1,3,5-trienyl]fura n -3(2H)-one (7) and its lower vinylogue (9) have been synthesised. Comparison of the spectra of compound (7) with those of natural wallemia C (2) has established the Z-stereochemistry of the trisubstituted double bond in the natural pigment.
M. Ito, K. Tsukida and T. P. Toube, J. Chem. Soc., Perkin Trans. 1, 1981, 3255 DOI: 10.1039/P19810003255
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