B(C6F5)3-Catalyzed Selective Chlorination of Hydrosilanes
Karina Chulsky
School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, 69978 Israel
Search for more papers by this authorCorresponding Author
Dr. Roman Dobrovetsky
School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, 69978 Israel
Search for more papers by this authorKarina Chulsky
School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, 69978 Israel
Search for more papers by this authorCorresponding Author
Dr. Roman Dobrovetsky
School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, 69978 Israel
Search for more papers by this authorGraphical Abstract
Cl-early a winning combination: Hydrosilanes underwent selective chlorination upon treatment with HCl in the presence of a catalytic amount of B(C6F5)3 with the liberation of H2 (see scheme). For the chlorination of di- and trihydrosilanes, the adduct Et2O⋅B(C6F5)3 was found to be a more selective catalyst.
Abstract
The chlorination of Si−H bonds often requires stoichiometric amounts of metal salts in conjunction with hazardous reagents, such as tin chlorides, Cl2, and CCl4. The catalytic chlorination of silanes often involves the use of expensive transition-metal catalysts. By a new simple, selective, and highly efficient catalytic metal-free method for the chlorination of Si−H bonds, mono-, di-, and trihydrosilanes were selectively chlorinated in the presence of a catalytic amount of B(C6F5)3 or Et2O⋅B(C6F5)3 and HCl with the release of H2 as a by-product. The hydrides in di- and trihydrosilanes could be selectively chlorinated by HCl in a stepwise manner when Et2O⋅B(C6F5)3 was used as the catalyst. A mechanism is proposed for these catalytic chlorination reactions on the basis of competition experiments and density functional theory (DFT) calculations.
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