Reaction of 2-ethyl-1,3,2-bezoxaphospholine with calix[4]resorcinarenes

By reaction of calix[4]resorcinarene with 2-ethyl-1,3,2-benzoxazaphospholin e in 1:1 ratio we prepared a cavitand possessing one dioxaphosphocinic frag ment on the upper circle of the molecule. Reaction of the same compounds in ether solution in 1:4 and 1:8 ratio according to the data of spectral meth ods leads initially to formation of addition product, the P-H phosphorane w ith composition 1:4. This compound is not stable and on keeping forms 2-oxo -2-ethyl-1,3,2-benzoxazaphospholine, spirophosphorane, omicron -aminophenol and phosphorylated calixarene. In the reaction of the aminoalkylated calix arene with 2-ethyl-1,3,2-benzoxazaphospholine we isolated a compound posses sing four hydrophoshonyl fragments on the upper circle of the calixarene ma trix.