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. 2020 Aug 4;26(50):11625–11633. doi: 10.1002/chem.202002324

Scheme 2.

Scheme 2

Preparation of KMFB and KDFB starting from BF3⋅OEt2. One formula unit of NaDFB⋅(CH3)2CO in the crystal (displacement ellipsoids at 50 % probability; H atoms are shown with arbitrary radii.) Selected bond lengths (Å) and angles (°) (range of bond lengths and angles where applicable): B−F 1.392(2)‐1.396(2), B−C 1.623(2)‐1.630(3), C≡N 1.145(3)‐1.147(2), B‐C≡N 177.9(2)‐178.5(2), C‐B‐F 109.31(14)‐110.28(15), C‐B‐C 108.15(15), F‐B‐F 109.89(14), Na⋅⋅⋅F 2.2782(14)‐2.2965(11), Na⋅⋅⋅N 2.439(2)‐2.741(2), Na⋅⋅⋅O 2.3956(11).