A chelated borinium cation

Abstract

Two coordinate boron cations are rare. Herein we report the synthesis of [RNSiMe₂CH₂]₂BF (R = Dipp 3, 1-Ad 5) (Dipp = C₆H₃(iPr)₂, Ad = C₁₀H₁₅) via the reaction of BF₃ with the corresponding dilithiated diamides. Subsequent abstraction of fluoride provided the corresponding borinium salts, [(RNSiMe₂CH₂)₂B][B(C₆F₅)₄] (R = Dipp 6, 1-Ad 8). While the former was generated, the latter proved isolable and was crystallographically characterized.