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A convenient method for the preparation of strongly Lewis acidic tris-perfluoro-tert-butoxyborane B(OR F ) 3 (1), (OR F = OC(CF 3 ) 3 ) was developed, and its X-ray structure was determined. 1 was used as a precursor, guided by density functional theory (DFT) calculations and volume-based thermodynamics, for the synthesis of [NE 4 ][NCB(OR F ) 3 ] (3) and [NMe 4 ][FB(OR F ) 3 ] (5) and the novel large and weakly coordinating anion salts [Li 15-Crown-5][B(OR F ) 4 ] (2) and [NE 4 ][CN{B(OR F ) 3 } 2 ] (4). The stability of [B(OR F ) 4 ] - was compared with that of some related known weakly coordinating anions by appropriate DFT calculations.

Synthesis, Characterization, and Properties of Weakly Coordinating Anions Based on tris-Perfluoro-tert-Butoxyborane