Cobalt-mediated synthesis of tricyclic dienes incorporating fused four-membered rings. Unprecedented rearrangements and structural characterization of a cobalt- …

E Dunach, RL Halterman…

Index: Dunach,E.; Halterman,R.L.; Vollhardt,K.P. Journal of the American Chemical Society, 1985 , vol. 107, p. 1664

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Citation Number: 29

Abstract

Abstract: The CpCo (C0) 2-mediated intramolecular (2+ 2+ 2) cycloaddition of enediynes 6 and 9 leads to two tricyclic diene systems 13 and 21 incorporating four-membered rings, a novel transformation. Both cyclizations give unprecedented and unexpected products, the former catalytically and by intra-ring diene rearrangement, the latter stoichiometrically but involving an inter-ring diene shift. A sequence of 2D NMR experiments in conjunction with ...