1: acetamide With acetyl chloride in acetic acid 0.25 h; Cooling with ice; 2: methyl 2-oxo-cyclopentane-1-carboxylate With phosphorus trichoride in acetic acid T=20°C; Cooling with ice; Further stages;
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Ziora, Zyta; Kafarski, PaweL
Phosphorus, Sulfur and Silicon and the Related Elements, 2009 , vol. 184, # 4 p. 1047 - 1053
Nicholas; Erickson
Journal of the American Chemical Society, 1926 , vol. 48, p. 2175
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Erickson
Chemische Berichte, 1926 , vol. 59, p. 2668