Phosphonic acid

from Wikipedia, the free encyclopedia

Phosphonic acid is the IUPAC name for the acid HP (OH) 2 , which is a tautomer of phosphinic acid [H 2 P (= O) (OH)]. Salts and esters of phosphonic acid are called phosphonites .

Only organic phosphonic acids are known, e.g. B. Phenylphosphonous acid.
Phosphonic acids should not be confused with phosphinous acid .

Manufacturing

Oxidation of primary phosphines to phosphonic acid

During the air oxidation of primary phosphines (R – PH 2 ), the corresponding organic phosphonous acid is formed via the intermediate stage of the primary phosphine oxides (e.g. with R = phenyl group ).

Synthesis of phenylphosphonous acid (R = phenyl)

Oxidation of secondary phosphines to phosphinous acid and phosphinic acid

The oxidation of secondary phosphines (R 2 PH), on the other hand, produces secondary phosphine oxides (R 2 HP = O), which tautomerize to phosphinous acid and can be further oxidized to phosphinic acids :

Synthesis of phosphinous acid and phosphinic acids

Individual evidence

  1. ↑ Otto-Albrecht Neumüller (Ed.): Römpps Chemie-Lexikon. Volume 4: M-Pk. 8th revised and expanded edition. Franckh'sche Verlagshandlung, Stuttgart 1985, ISBN 3-440-04514-5 , p. 3160.
  2. ^ Siegfried Hauptmann : Organic Chemistry , 2nd revised edition, VEB Deutscher Verlag für Grundstoffindindustrie, Leipzig, 1985, p. 540, ISBN 3-342-00280-8 .
  3. ^ Siegfried Hauptmann: Organic Chemistry , 2nd revised edition, VEB Deutscher Verlag für Grundstoffindustrie, Leipzig, 1985, p. 541, ISBN 3-342-00280-8 .