1: With sodium hydride; tert-butyl alcohol in diethyl ether Guareschi-Thorpe type condensation; 7 h; Reflux; 2: With hydrogenchloride; water in ethanol T=20°C; 0.5 h;
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potassium 2-methyl-2-butoxide in tetrahydrofuran; toluene T=20°C; 24 h;
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Cardoso, Ana Lucia; Gimeno, Lourdes; Lemos, Americo; Palacios, Francisco; Pinho E Melo, Teresa M. V. D.
Journal of Organic Chemistry, 2013 , vol. 78, # 14 p. 6983 - 6991