Phosphinous acid

Structural formula
General
Surname	Phosphinous acid
Molecular formula	H 3 OP
External identifiers / databases
PubChem	143409
ChemSpider	126521
Wikidata	Q27109992
properties
Molar mass	49.997 g mol −1
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Phosphinous acid is the IUPAC name for the acid of trivalent phosphorus, unknown in its free form, with the empirical formula H ₂ P-OH. The salts and esters of phosphinous acid are phosphinites . There are organic phosphinous acids, e.g. B. Diphenylphosphinige acid.

Phosphinous acids should not be confused with phosphonic acid .

Manufacturing

Oxidation of secondary phosphines to phosphinous acid and phosphinic acid

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

Oxidation of primary phosphines to phosphonic acid

In the air oxidation of a primary phosphine (RPH ₂ ), the corresponding organic phosphonous acid is formed via the intermediate stage of the primary phosphine oxide (e.g. with R = phenyl group ):

Individual evidence

↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ 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. 3157.
^ Siegfried Hauptmann: Organic chemistry . 2nd revised edition, VEB Deutscher Verlag für Grundstoffindustrie, Leipzig 1985, ISBN 3-342-00280-8 , p. 541.
^ Siegfried Hauptmann : Organic chemistry . 2nd revised edition, VEB Deutscher Verlag für Grundstoffindindustrie, Leipzig 1985, ISBN 3-342-00280-8 , p. 540.

[NV-1] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Römpp-2] 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. 3157.

[Hauptmann2-3] Siegfried Hauptmann: Organic chemistry . 2nd revised edition, VEB Deutscher Verlag für Grundstoffindustrie, Leipzig 1985, ISBN 3-342-00280-8 , p. 541.

[Hauptmann1-4] Siegfried Hauptmann : Organic chemistry . 2nd revised edition, VEB Deutscher Verlag für Grundstoffindindustrie, Leipzig 1985, ISBN 3-342-00280-8 , p. 540.