1: With hydrogen bromide; acetic acid; thiourea in water 3 h; Inert atmosphereReflux; 2: With sodium hydroxide in water T=20°C; 3: With sulfuric acid T=10°C; pH=2 - 3;
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Huston; Fox; Binder
Journal of Organic Chemistry, 1938 , vol. 3, p. 252