Amido-derivatives of metals and metalloids. Part V. Lewis acid behaviour of certain borazines and aminoboranes

Abstract

Aminoboranes and borazines having electronegative substituents (Cl) at boron yield crystalline adducts with bases such as pyridine. Steric effects in the base are important with regard to complex stability (pyridine complexes are more stable than those of α-picoline, which in turn are more stable than 2,6-lutidine complexes). Structural effects in the Lewis acid may determine stoicheiometry. Thus, in the series R₂NBCl₂/py, complexes of 1 : 1 (R = Prⁱ), 1 : 2 (R = Me), and 1 : 3 (R = Et) stoicheiometry are found. These are believed to be R₂N(Cl₂)[graphic omitted]C₅H₅, [(R₂N)CIB py₂]⁺Cl^–, and [(R₂N)B py₃]-⁺2Cl^–, respectively.