1: 4-bromo-aniline With hydrogenchloride; sodium nitrite in water T=0°C; 2: ethyl 2-chloro-3-oxobutanoate With sodium acetate in ethanol; water T=0°C; 4 h;
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Favrel
Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1902 , vol. 134, p. 1313