Boron-nitrogen rings applications

One of the major problems in the chemistry of three-coordinated boron-nitrogen compounds is their relative instability towards hydrolysis 79>8°). This feature reduces their possible applications in many areas such as in the medicinal field or utilization for polycondensation-products. However, steric hindrance by bulky substituents on the borazine ring leads to compounds with enhanced hydrolytic stability, particularly when no solvent is present in which they may dissolve. This observation has resulted in extensive research on sterically hindered boron-nitrogen ring compounds. 

The formation of a system containing two boron and three nitrogen atoms in a five membered ring cannot be expected to proceed in high yield from a spontaneous reaction. Indeed, preparations of this ring system utilize the most versatile reaction type applicable to B—N compounds the transamination. Transamination usually proceeds by replacement of organo-substituted amino groups by less volatile amines i8 -i8 ) jn an equilibrium reaction. 

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