Ionization constants of cyclic derivatives of phosphorus acids in n-propyl alcohol

Abstract

1. Ionization constants for various types of cyclic phosphorus acids have been determined in abs. n-propanol. The pKa values of these acids are determined by the electronic nature of the dioxyalkylene substituent and the structural singularities of the exocyclic reaction center. 2. Factors affecting the phosphonate-phosphite tautomerism of the cyclic phosphorus acids are suggested. Passage from the phosphonate form of the phosphoric acids to the phosphite is promoted by the acceptor activity of the O-R-O group and the low value of the intracyclic angle at the P atom. © 1978 Plenum Publishing Corporation.