potassium hydrogensulfate in anhydrous xylene T=150°C; 1 h;

1.1: potassium hydrogensulfate / anhydrous xylene / 1 h / 150 °C 2.1: boron trichloride / dichloromethane / 0 °C / |Inert atmosphere 2.2: polyphosphoric acid / 3 h / 40 - 130 °C / |Inert atmosphere 3.1: potassium permanganate / acetone / 3 h / 0 °C View Scheme

1: 3 -bromo -N,N-dimethylaniline With n-butyllithium in tetrahydrofuran; cyclohexane T=-78°C; 0.25 h; Schlenk techniqueInert atmosphere; 2: acetone in tetrahydrofuran; cyclohexane T=-78°C; 0.25 h; Schlenk techniqueInert atmosphere;

in tetrahydrofuran

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