Two new routes to pulvinones have been developed, one of which involves a novel Wittig reaction. For the first time, members of the E-series, including the parent (E)-pulvinone, are reported and the structural elucidation of the geometric isomers is described. A method for quantitatively converting (E)-pulvinones into (Z)-pulvinones is presented, together with a technique for differentiating between the isomers.
A. C. Campbell, M. S. Maidment, J. H. Pick and D. F. M. Stevenson, J. Chem. Soc., Perkin Trans. 1, 1985, 1567 DOI: 10.1039/P19850001567
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