Additionen von Stickstoffbasen an cyclische Organoborsäureester

Additive-Reactions of Nitrogen Bases to Cyclic Esters of Organoboric Acids The reaction of BBr₃, C₆H₅BCl₂ and CH₃BBr₂ with Diols respectively Dithiols yields 2-Bromo- and 2-Organo-1,3,2-diheteroborolanes, -borinanes and -boroles. These compounds and also non cyclic esters and thioesters of organoboric acids are reacted with pyridine, 2-picoline, 4-picoline and 2,4,6-collidine and thereby the enthalpie (ΔH) is measured. From these values it is tried to conclude on Lewis acidity of the boron atom in the different compounds.