triethylsilane; trifluoroacetic acid T=5 - 28°C; 3.5 h;

1.1: isopropylmagnesium chloride / tetrahydrofuran / 2 h / 0 - 4 °C / Industry scale 1.2: -5 - 3 °C / Industry scale 1.3: 3 - 4 °C / Industry scale 2.1: trifluoroacetic acid / 1.33 h / 10 °C / Inert atmosphere; Industry scale 2.2: 2.58 h / 10 - 11 °C / Industry scale; Inert atmosphere View Scheme

1.1: isopropylmagnesium chloride / tetrahydrofuran / 2 h / 0 - 4 °C / Industry scale 1.2: -5 - 3 °C / Industry scale 1.3: 3 - 4 °C / Industry scale 2.1: trifluoroacetic acid / 1.33 h / 10 °C / Inert atmosphere; Industry scale 2.2: 2.58 h / 10 - 11 °C / Industry scale; Inert atmosphere View Scheme