On the Reactivity of RSnCl and RSiMe3 {R = 4-tBu-2,6-[P(O)(OiPr)2]2C6H2} towards BF3·OEt2: Competing Lewis Acidities

The reactions of boron trifluoride with the organostannylene RSnCl {R = 4‐tBu‐2,6‐[P(O)(OiPr)2]2C6H2} and the organosilane RSiMe3 provided the corresponding 1:1 and 1:2 complexes, respectively, through the formation of P=O→B interactions. In the former reaction, even with excess BF3·OEt2, no Sn→B complexation involving the lone electron pair at the tin(II) center was observed. The experimental results are supported by DFT calculations. The reactions of boron trifluoride with the organostannylene RSnCl {R = 4‐tBu‐2,6‐[P(O)(OiPr)2]2C6H2} and the organosilane RSiMe3 provided the corresponding 1:1 and 1:2 complexes, respectively, through the formation of P=O→B interactions. The experimental results are supported by DFT calculations.