Dithiophosphonic anhydrides

Phosphorus(v) oxide reacts at 275-325° with aromatic hydrocarbons such as benzene, toluene, and naphthalene, and also with chlorobenzene, giving phosphonic anhydrides which are preferably worked up by hydrolysis to the phosphonic acids.170 Phosphorus(v) sulfides react at appreciably lower temperatures, yielding dithiophosphonic anhydrides (9) the... 

Reaction of phosphorus(v) sulfide with aromatic hydrocarbons in the presence of aluminum chloride affords a simple method of preparing aromatic di-thiophosphinic acids 173 or the P4S10 can be replaced by the dithiophosphonic anhydride (9).172... 

Die in ds. Handb., Bd. XII/1, S. 616 genannte Methode zur Synthese von Dithiophosphon-saure-anhydriden aus Phosphor(V)-sulfid und Aromaten laBt sich auch auf Thiophen iibertragen. Aus siedendem Thiophen, in dem Phosphor(V)-sulfid gelost ist, scheiden sich nach 48 Stdn. 86% Thiophen-2-dithiophosphonsdure-anhydrid kristallin ab662. 

Oxo-aIkansaure-nitrile und -amide reagieren mit 4-Methoxy-bcnzol-dithiophosphon-saure-anhydrid bei lstdgm. Erhitzen dcr Komponenten in Toluol auf 110°zu 2-(4-Me-thoxy-phenyl)-4-thioxo-3,4-dihydro-2H- l,3,2-oxazaphosphorin-2-sulfi-den (72-940/o)CMO ... 

L. Maier, Preparation, Structure and Properties of Thionophosphine Sulfides and Oxides (Dithiophosphonic and Monothiophosphonic Anhydrides), Topics in Phosphorus Chemistry 10, 129 (1980). 

Dithiadiphosphetans.—2,4-Disubstituted 1,3,2,4-dithiadiphosphetan 2,4-disulphides (155) are the anhydrides of dithiophosphonic acids. They have been prepared by the reaction of (156) with The di-t-butyl derivative (155 ... 

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