trichlorosilane in xylene 1.) from 0 deg C to RT, 2.) from 100 to 120 deg C, 2 h, 3.) reflux, 3 h;

1: 68 percent / NaBH4 / tetrahydrofuran; H2O; CH2Cl2 / 42 h / 20 °C 3: 95 percent / HSiCl3 / xylene / 1.) from 0 deg C to RT, 2.) from 100 to 120 deg C, 2 h, 3.) reflux, 3 h View Scheme

1: 91 percent / pyridine / tetrahydrofuran / 0 - 20 °C 2: 68 percent / NaBH4 / tetrahydrofuran; H2O; CH2Cl2 / 42 h / 20 °C 4: 95 percent / HSiCl3 / xylene / 1.) from 0 deg C to RT, 2.) from 100 to 120 deg C, 2 h, 3.) reflux, 3 h View Scheme

(i) Li, THF, (ii) /BRN= 3224885/; Multistep reaction;

in tetrahydrofuran 1.) -4 deg C, 20 min, 2.) room temp., 30 min;