Boryl special

Compounds belonging to this series are of special interest because they exhibit the properties of both cyclic and acyclic structures as a result of ion complex tautomerism. They were obtained via borylation of hydroxy-alky lphosphines in the presence of tertiary amines [Eq. (64)], whereas primary and secondary amines give aminomethylphosphines under such conditions (84UK625 86JZV1641, 86MI1 90MI1). 

Borylation of hydroxyalkylphosphines in the absence and presence of additional reagents is the most effective and universal method of synthesizing the boroxyalkyl derivatives of phosphorus, providing a wide variety of structures. Among other methods of synthesis of boroxyalkylphosphines from aminomethylphosphines is of special interest. This is illustrated in... 

---