Abstract
Palladium acetate [Pd(OAc)2] and 1,4-bis(diphenylphosphino)butane (dppb) catalyse regioselective cyclocarbonylation of bisallyl derivatives of bisphenols affording seven-membered ring bislactones in good yields. Double cyclocarbonylation reactions carried out using different conditions afforded bislactones with two different ring sizes (7–6 and 7–5-membered). Copyright © 2000 John Wiley & Sons, Ltd.
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