A chelated borinium cation.

Two coordinate boron cations are rare. Herein we report the synthesis of [RNSiMe 2 CH 2 ] 2 BF (R = Dipp 3, 1-Ad 5) (Dipp = C 6 H 3 (iPr) 2 , Ad = C 10 H 15 ) via the reaction of BF 3 with the corresponding dilithiated diamides. Subsequent abstraction of fluoride provided the corresponding borinium salts, [(RNSiMe 2 CH 2 ) 2 B][B(C 6 F 5 ) 4 ] (R = Dipp 6, 1-Ad 8). While the former was generated, the latter proved isolable and was crystallographically characterized.