Phosphorus III

Phosphorus(III) oxide dissolves in several organic solvents, for example benzene, carbon disulphide the molecular weight in these solvents corresponds to the formula P40(, as does the density of the vapour, and the structure is ... 

Phosphorus(III) oxide reacts slowly with oxygen at ordinary temperatures to give the pentoxide, P40,g. The reaction is rapid if the oxide is heated in air. It is oxidised vigorously by chlorine and bromine which form the oxidehalides, POX3. 

Phosphorus(III) oxide dissolves slowly in cold water to yield phosphoric(III) acid, H3PO3 (phosphorous acid) ... 

Here again the simple formulation [Sb ] is used to represent all the cationic species present.) The hydrolysis is reversible and the precipitate dissolves in hydrochloric acid and the trichloride is reformed. This reaction is in sharp contrast to the reactions of phosphorus(III) chloride. 

Phosphorus(III) Oxide. Phosphoms(III) oxide [12440-00-5] the anhydride of phosphonic acid, is formed along with by-products such as phosphoms pentoxide and red phosphoms when phosphoms is burned with less than stoichiometric amounts of oxygen (62). Phosphoms(III) oxide is a poisonous, white, wax-like, crystalline material, which has a melting point of 23.8°C and a boiling point of 175.3°C. When added to hot water, phosphoms(III) oxide reacts violentiy and forms phosphine, phosphoric acid, and red phosphoms. Even in cold water, disproportionation maybe observed if the oxide is not well agitated, resulting in the formation of phosphoric acid and yellow or orange poorly defined polymeric lower oxides of phosphoms (LOOP). 

Heterocyclothiazenes containing phosphorus(III) or other p-block elements... 

One of the most widely used methods for the formation of phosphate esters involves the conversion of a P-N bond of a phosphorus(III) compound to a P-O bond by ROH, catalyzed by l//-tetrazole, followed by oxidation to the phosphorus(V) derivative ... 

Chapter 5 in ref. 2, Phosphorus(III) ligands in rtansition-metal complexes, pp. 177 - 207. 

The propensity of phosphorus(III) compounds to oxidize to phosphorus(V) by formation of an additional P=0 bond is well illustrated by the... 

Phosphor-athcr, m. phosphoric ether (ester of phosphoric acid, specif, ethyl phosphate), -basis, phosphorus base, -bestimmung, /. determination of phosphorus, -blei, n. lead phosphide Min.) pyromorphite. -bombe, f. phosphorus bomb. -brandgranate, /. phosphorus incendiary shell, -brei, m. phosphorus paste, -bromid, n. phosphorus bromide, specif, phosphorus pentabromide, phos-phorus(V) bromide, -bromijr, n. phosphorus tribromide, phosphorus(III) bromide, -bronze, /. phosphor bronze, -calcium, n. calcium phosphide, -chlorid, n. phosphorus chloride, specif, phosphorus pcntachloride, phosphorus(V) chloride, -chloriir, n. phosphorous chloride (phosphorus trichloride, phosphorus(III) chloride), -dampf, tn. phosphorus vapor or fume, -eisen, n. ferrophos-phorus iron phosphide, -eisensinter, m. diadochite. 

Phosphorigsaureanhydrid, n. phosphorous anhydride (phosphorus trioxide, phosphorus-(III) oxide). 

D.16 Each of the following compounds has an incorrect formula. Correct each of the mistakes, (a) NaC03, sodium carbonate (b) Mg(C10)2, magnesium chlorite (c) P2Ofc, phosphorus(III) oxide. 

The molecules are tetrahedral, like P4, but an O atom lies between each pair of P atoms. Phosphorus(III) oxide is the anhydride of phosphorous acid, H3P03 (4), and is converted into the acid by cold water ... 

Group 4 metal complexes of the dianion [ BuNP( -N Bu)2PN Bu] polymerize ethylene in the presence of a co-catalyst, but they are readily deactivated [10,14]. This behaviour is attributed to coordination of the lone-pair electrons on the phosphorus(III) centers to Lewis acid sites, which initiates ring opening of the ligand [15]. 

The only structurally characterized derivative of a trisimido organophos-phonate anion is the spirocyclic tellurium(IV) complex (19), which is obtained from the interesting redox reaction between PhPCl2 and [Li2Te(N Bu)3 ] 2 [27]. The phosphorus(V)-centered ligands are generated by imide transfer from tellurium to the phosphorus(III) atoms with concomitant reduction of one-half of the tellurium in the Te(IV) reagent to elemental tellurium [27]. 

The reaction of ylides with phosphorus(iii) halides has been extended to the ylides (Me2N) Me3 P CH2, = 1, 2, or 3. Alkylation of the resulting stabilized ylides (20) with methyl iodide took place on the tervalent phosphorus, e.g. 

C. From Azides and Phosphorus(iii) Compounds.—Typical syntheses, which generally proceed smoothly at 20—50 °C, include... 

With phosphorus trichloride, a rather complex reaction results partly in the formation of [PhaP N uPPha PPhCl]+ Cl. The reactivity of the phosphorus(iii) atom is also demonstrated by its ability to desulphurize thiophosphoryl chloride, and its ready reactions with Group VI elements, diborane, and carbon disulphide ... 

NP=CHSiMe3, with diethylamine provides the aminophosphine Me SiNH-PNEt2(Cf SiMe ) which in turn adds a second mole of dimethylamine to give the novel phosphorus(III)-phosphorus(v) derivative 7. 

Significant recent advances have occured with phosphazenes (J ) and to a lesser extent silizanes (6) in contrast, polymers based on phosphorus(III) and nitrogen are virtually unknown. Because such systems offer opportunities for metal coordination, and in their oxidized forms could be valuable polymer precursors to PON ceramics (2), we have begun systematic studies of the structural and reactivity factors necessary for their formation. 

Since amine-phosphorus(III) halide condensation reactions are well-established low-energy routes to phosphorus-nitrogen bonds, they provide a logical starting point for examination of skeletally stabilized molecule synthesis. For our initial studies, reactants that are phenyl substituted as opposed to alkyl substituted... 

This geometry is undoubtedly imposed by the skeletal stabilizing unit. Other eight membered phosphorus(III)-nitrogen rings, (MePNMe)i, (9) and (PrNO G NP) (11) are crown shaped containing all chemically equivalent phosphorus atoms. In XI, because the phosphorus atoms are of two sets and one set is in a highly protected environment, the possibility of selective, "cavitand," coordination at phosphorus sites exists. 

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