1: With phosphate buffer; tetra(n-butyl)ammonium hydrogensulfate in water T=60°C; pH=7.8; 2: With hydrogenchloride in water T=70°C; pH=1; 5 h; Further stages.;
1: Pb(II) thiocyanate With dibromotriphenyl-phosphorane in dichloromethane Cooling with ice; 2: acetoacetic acid 6-butyl ester in dichloromethane Cooling with iceReflux;
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