Synthesis of compounds with several 1,3,2,5-dioxaboraphosphorinane fragments

Ester interchange of phenylboric and n-phenylenediboric acids by phosphorus-containing polyols, prepared in the course of interaction between phosphines and aldehydes, gives rise to formation of compounds containing two and more 1,3,2,5-dioxaboraphosphorinane cycles with different types of interbinding. Spatial structure is studied and reactivity of oligomer 1,3,2,5-dioxaboraphosphorinanes is considered. It is shown that their behaviour is similar to the one of mono- and bisheterocyclic 1,3,2,5-dioxaboraphosphorinanes