Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Abstract Acid polymers, −[N=P(OC6H5)2−x (OC6H4SO3H) x ] n (II), having an entirely inorganic chain of fifth-group elements, with acid equivalent values between 2.90 and 5.19 mEq/g and molecular weights (M w) of 105−106 (205≤n≤3582), have been obtained from −[N=P(OC6H5)2]− n (I), 4325≤n ≤ 20,300, in very strong acid medium (SO3/−P=N −=1.15−3.10 mol/mol). Sulfonation of the pendant substituents occurs first in the meta position and successively at the para carbons, presumably due to reduced conformational mobility as the degree of substitution (x) in II increases.
Type of Medium: