2-alkoxy-2-oxo-l,3,2-dioxaphosphorinanes

In the polymerization of 2-alkoxy-2-oxo-l, 3,2-dioxaphosphorinanes it Imb been shown that although kp does not depend too much on the structure of the substituent R, the rate constant of termination k, decreases with increasing size of the alkyl group and for the large substituents (e.g. R = ( 113)380 kt becomes eventually so small that it cannot be measured. The corresponding rate constants and activation parameters are given in Table 17. 

Among the tetracoordinated cyclic esters of phosphoric acid, 2-alkoxy-2-oxo-l,3,2-dioxaphosphorinanes (19) have been studied in detail. Trityl salts (PhsC A", where A=Pp6, Asp6, SbPe) and/or triflic esters (CFsSOsMe and... 

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