Phosphites/phosphonates

R2HP03 0 II H—P—OR phosphonate ester (phosphite) phosphonic acid, mono- and diesters exist... 

Diethyl phosphite Phosphonic acid, diethyl ester (762-04-9), 75, 23... 

Diethyl phosphite Phosphonic acid, diethyl ester (762-04-9), 75, 22 Diethyl sulfate Sulfuric acid, diethyl ester (64-67-5), 77, 153 Diethyl tartrate, 76, 93 Diethylzinc Zinc, diethyl- (557-20-0), 76, 89... 

A method of ion chromatography with conductivity detection of ions after eluent suppression for analysis of phosphites (phosphonate ion), was developed (Glenn et al., 1990 Ouimette and Coffe, 1988). It is rapid and relatively simple and shows recoveries are higher than 95% and a detection limit in grapes of 0.5-1.0 ppm is reported. 

The estimation of phosphorus by g.l.c. has been reviewed. Cyclic phosphites, phosphonates, and phosphates have been analysed by g.l.c. The zinc, gold, and cadmium chelates of dialkyl dithiophosphinates (235 ... 

We turn now to the comparison of phosphate esters with esters of other phosphorus oxyacids, namely phosphites, phosphonates and phos-phinates. Phosphites are distinguished from phosphates by a lower formal valence number (l.t. by a basically different bonding structure), whereas in phosphonates and phosphinates the phosphorus is formally pentavalent, as in phosphates. Phosphonates and phosphinates have direct carbon-phosphorus bonding, while the linkage of the organic groups in the phosphate esters is all of the carbon-oxygen-phosphorus type. 

A different method was worked out for radic al substitution by cyclohexane.169 Irradiation of this hydrocarbon together with a dialkyl phosphite, phosphonous... 

Alkyl, Cycloalkyl. Aralkyl and Related Acids. - Reports on Michaelis-Arbuzov reactions continue to be widely distributed throughout the literature. Phosphite-phosphonate isomerization occurs in the presence of copper(I)... 

Phosphites Phosphonic acids Phosphorous acid esters... 

Phosphonic acid, di-9-octadecenyl ester (Z,Z)-. See Dioleyl hydrogen phosphite Phosphonic acid, dioctadecyl ester. See Distearyl phosphite... 

The high phosphate concentration in cells might indicate the abundance of phosphorus compounds in the primordial waters [85,251,252]. Since the concentration of phosphate in sea water is low (the phosphates of Ca and Mg are poorly soluble in water), it has been argued that more reduced compounds such as hypophosphite (phosphinate, P022-) and/or phosphite (phosphonate, P033-), which have better solubility in sea water, could have been abundant in the primeval, more reduced ocean [252-258]. This suggestion is supported by findings of diverse systems of hypophosphite and phosphite oxidation in prokaryotes (see [259] for a review). 

H-phosphonate diesters are tautomeric systems in which the phosphite-phosphonate equilibrium is practically entirely shifted to the four-coordinated phosphonate form [1,2]. 

The formation of product II has been attributed to phosphite-phosphonate rearrangement from the corresponding phosphorus (HI) intermediates of the type I [157], Its analogue 2,3-butylene phosphonic acid (R=CH(CH3)CH(CH)3) forms only phosphonate-type adducts of the type II under these conditions. 

Section 2.4 reviews organophosphorous compounds as nonflammable or flame-retardant electrolytes for lithium-ion batteries. These include organic phosphates, phosphites, phosphonates, or phosphazenes, and a phosphonamidate as co-solvents or additives. The author introduces polymeric gel electrolytes containing these flame-retardant components. 

Trialkyl aluminium complexes with various degrees of stability are formed with phosphines, phosphine oxides, phosphites, phosphonates and phosphinates as well as with amines and other non-phosphorus ligands (9.130). 

Phosphite (phosphonate) and hypophosphite (phosphinate) radicals are produced from phosphites and hypophosphites by y-ray excitation of their crystalline salts, or by oxidation of their alkaline solutions. 

Best-known examples of Equation 13.239 with Z = 0 are phosphite-phosphonate (3.37) and phosphonite-phosphinite (6.203) equilibria. Other examples are indicated in Equation 6.26. Similar equilibria involving and exist with N-containing groups (7.9) and (7.11) and with the corresponding thio- and seleno-derivatives, for example, (9.415), (9.416), (9.454) and (9.459). ... 

T ris( trimethylsilyl)phosphite Phosphonic acids from iodides... 

Laser desorption/ionisation FT-MS and FAB-MS have been nsed to determine nonvolatile polymer additives such as thioester, phosphite, phosphonate, and hindered amine types [28]. 

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