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Padwa A, Lipka H, Watterson SH, Murphree SS. Phenylsulfonyl ene-allenes as efficient precursors to bicyclic systems via intramolecular [2 + 2]-cycloaddition reactions. J Org Chem. 2003 Aug 08;68(16):6238–50. doi: 10.1021/jo0345796. PMID: 12895056. |