The reaction product of pyrrolidin-2-one with hydrogen chloride and phosphorous pentachloride has been shown to be 2-(2,3-dichloro-Δ2-pyrrolin-1-yl)-Δ2-pyrroline, rather than 2-chloro-Δ1-pyrroline as previously reported, by a single crystal X-ray structure determination of the hydrobromide salt of the product.
F. L. Suddath, A. C. Baillie, J. A. Bertrand and J. R. Dyer, J. Chem. Soc. D, 1971, 1153 DOI: 10.1039/C29710001153
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