trimethylsilyl trifluoromethanesulfonate in acetonitrile T=30°C; 20 h;

1: 94 percent / molecular sieves 4A / benzene / 1 h / Ambient temperature 2: 61 percent / trimethylsilyl triflate / acetonitrile / 20 h / 30 - 35 °C View Scheme

2,4,6-trimethylphenylmagnesium bromide in tetrahydrofuran T=0°C; 1 h;