Bromination of 7,11-diphenylspiro[5.5]undecane-1,9-dione (2) in dichloromethane indicated the involvement of an unexpected proximity effect when the bridged acetal (4) and the bridged ether (5) were isolated.
L. P. L. Piacenza, J. Chem. Soc., Chem. Commun., 1978, 425 DOI: 10.1039/C39780000425
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