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J. Chem. Soc., 1952, 1224-1231
A. R. Pinder and Robert Robinson
221. Experiments on the synthesis of substances related to the sterols. Part L. The A→BCD route. Part III
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http://dx.doi.org/10.1039/JR95200012242)
J. Am. Chem. Soc., 1946, 68 (5), pp 751–753
Louis A. Pinck, Guido E. Hilbert
Molecular Rearrangement of Fluorylidene Dimethyl Sulfide to Fluorene-1-dimethyl Sulfide
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http://dx.doi.org/10.1021/ja01209a011