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A Chemical Abstracts search of compound 9a reveals 21 references to the Z-isomer and 6 to the E-isomer. However, the reports of the E-isomer only mention this compound in passing, and to the best of our knowledge full characterisation data has never been reported for this double-bond isomer. We are unaware of examples where full characterisation data of both the E- and Z-isomers of a single alkylidenepyrrolidine have been reported.
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