The challenging metal-free catalytic hydrogenolysis of silyl chlorides to hydrosilanes is unlocked by using an inverse frustrated Lewis pair (FLP), combining a mild Lewis acid (Cy BCl) and a strong phosphazene base (BTPP) in mild conditions (10 bar of H , r. t.). In the presence of a stoichiometric amount of the base, the hydrosilanes R SiH (R=Me, Et, Ph) are generated in moderate to high yields (up to 95 %) from their chlorinated counterparts. A selective formation of the valuable difunctional monohydride Me SiHCl is also obtained from Me SiCl . A mechanism is proposed based on stoichiometric experiments and DFT calculations; it highlights the critical role of borohydride species generated by the heterolytic splitting of H .
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