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Reactions of Four-membered Rings

Excellent stereocontrol is observed in reactions of four-membered rings. For instance, methyl a-allylpenicillinate 1,1-dioxide is formed as a single isomer via radical allylation (Scheme 1, Eq. 1.1) [3]. Interestingly, the yff-isomer was obtained when a gew-dibromide was used as radical precursor (Scheme 1, Eq. 1.2). In this approach, the stereochemistry is established during the reduction of the intermedi-... [Pg.400]

I 3 Reactions of Four-Membered Ring Compounds cat. [RhCI(nbd)]2... [Pg.90]

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Four-membered

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