Abstract
AbstractA series of different aryl‐linked (frustrated) Lewis pairs with perfluoroethylsilyl and ‐stannyl functions as Lewis acids has been prepared. The 1,2‐phenylene linked tin/phosphorus Lewis pair with a di‐tert‐butylphosphanyl unit as base shows a strong intramolecular donor‐acceptor interaction, but still readily adds hydrogen chloride. At the same time, the analogous silicon/phosphorus Lewis pair could not be obtained due to the decomposition of at least one perfluoroethyl group. With a sterically more demanding 2,2,6,6‐tetramethylpiperidine base, stable Lewis pairs could be obtained for both, silicon and tin. However, they do not show activity in small molecule activation with H2, phenyl isocyanate, CS2 or SO2. Furthermore, 2‐benzyl‐linked tin/nitrogen and silicon/phosphorus Lewis pairs were synthesized. Studies on their reactions towards small molecules did not show any reactivity, probably caused by an unfavorable preorganization due to rotation of the benzyl position.
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