Pyridine Adducts of Tricyano‐ and Dicyanoboranes

Cyanoborane adducts of the Lewis acids B(CN)3, BF(CN)2, and BH(CN)2 with pyridine 4-cyanopyridine have been obtained in high yields. The syntheses were accomplished by oxidation readily available potassium salts cyano(hydrido)borate anions [BH(CN)3]− (MHB), [BFH(CN)2]− (FHB), [BH2(CN)2]− (DHB) bromine presence respective derivative C5H5N or 4-CN-C5H4N as starting material. All six cyanoborane characterized NMR vibrational spectroscopy, elemental analysis, single-crystal X-ray diffraction. reduction has investigated cyclic voltammetry acidity different cyanoboranes assessed using Gutmann-Beckett method. Selected experimental data trends are compared to theoretical ones, for example fluoride ion affinities (FIAs).