Tetrahedron Letters p. 1441 - 1444 (1984)
Update date:2022-08-04
Topics:
Bestmann, H.J.
Schmid, G.
α,β-Unsaturated carbonyl compounds 1 and phosphacumulene ylides 2 undergo a <4+2>-cycloaddition with formation of pyran-substituted phosphoranes 3.Benzoic acid catalyzed Hofmann degradation of 3 yields the deeply coloured pyran derivatives 5.
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