1: 1-(4-[2-methylpropyl]-phenyl)-ethanone; N,N-dimethyl-formamide With trichlorophosphate T=20°C; 2: With hydroxylamine hydrochloride T=0 - 100°C; 3: 2-mercaptoacetic acid methyl ester With sodium methylate in N,N-dimethyl-formamide T=0°C; Further stages.;