An unexpected opening of a proximal bond in the anellated four-membered ring of benzocyclobutene tricarbonylchromium(0) complexes occurs when the 1-hydroxy-1-hex-5-enyl complex 2 is treated with base: in general, rupture of the distal bond is observed. The reaction of tricarbonyl-η6-(1-oxobenzocyclobutene)chromium(0)1 with primary amines also causes a proximal ring-opening reaction.
M. Brands, H. G. Wey and H. Butenschön, J. Chem. Soc., Chem. Commun., 1991, 1541 DOI: 10.1039/C39910001541
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