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. Author manuscript; available in PMC: 2013 Mar 14.
Published in final edited form as: J Org Chem. 2004 Nov 26;69(24):8514–8517. doi: 10.1021/jo048848j

FIGURE 1.

FIGURE 1

Possible intermediate configurations during the retroconjugate addition reaction (A-F) and alkyl chloroformate induced ring opening reaction (A′-F′).