Dehydrogenative silylation of γ C–H bonds of heteroarenes^a.

^aUnless otherwise specified, reactions were conducted by pretreatment of a solution of 1 (0.5 mmol) and cat. B (5 mol%) in o-xylene (2 mL) at 100 °C for 6 h, and then tbe (3 equiv.) and Et₃SiH (2 equiv.) were added for further reaction.

^bTrace amount (<5%) of monosilylation product could be detected by GC-MS.

^cAt 140 °C, starting materials recycled.

^dPh₃SiH, Ph₂MeSiH, or PhMe₂SiH was used instead of Et₃SiH.