Silver diethyl phosphate

F. Zecchini gave for the refraction eq. 26-04 with the / -formula, and 15-17 with the /i2-formula. 0. Stelling measured the X-ray K-absorption spectrum of phosphorous acid, and of its salts and di-esters, and found that the results agree with the assumption that the phosphorus is tervalent with the solids, and tautomeric quinque- and ter-valent in soln. Phosphorous acid, the di-esters, methyl phosphorous acid, and ferric monopropyl phosphate have the structure RO)2 PO.H sodium diethyl phosphite, (C2H50)2 PO.Na silver diethyl phosphate, (C2H50)2 PO.OAg and monoacetyl phosphorous acid ... 

Peroxy acids. Konen and Silbert have developed a mild, general synthesis of peroxy acids entailing first acylation of silver diethyl phosphate in ether solution followed by perhydrolysis of the mixed anhydride with hydrogen peroxide (98%... 

OSAZIRIDINES r-Amyl hydroperoxide. N-OXIDES r-Amyl hydroperoxide. PEROXY ACIDS Silver diethyl phosphate. POLYCLIC HYDROCARBONS Triphen-ylpbosphine. 

Silicon tetrachloride, 424-425 Silver, 164 Silver acetate, 436 Silver carbonate, 67,425 Silver carbonate-Celite, 425-426 Silver p-chlotobenzoate, 79 Silver diethyl phosphate, 428 Silver fluoroborate, 78, 81, 82, 95, 211, 428-429... 

Temperature dependence studied. C(z)-labelled salt temperature dependence studied (77-"290 K). y-irr. of silver diethyl phosphate at 77 K. ... 

TV-Bromosuccinimide is recommended as a mild, efficient reagent for the a-bromination of acids this reaction, previously considered to be a free-radical process, has now been shown to be ionic in nature, and also to be subject to acid catalysis. A general synthesis of per-acids is provided by per-hydrolysis of acyldiethylphosphates under acid catalysis (Scheme 9) the intermediate esters are prepared by acylation of silver diethyl phosphate (24). This method is useful for the preparation of methoxyaromatic and sterically hindered per-acids, e.g. trimethylperacetic acid teing obtained from pivalic acid in 84% yield. A complementary method involving the intermediacy of acid imid olides has been published. The electrolysis of some a-ketoacids has been studied Kolbe processes can be suppressed under certain conditions. ... 

The reagent is prepared by the reaction of diethyl phosphate (0.12 mole) and silver carbonate (0.05 mole) in ether at 25° 82% yield. 

Early colorimetric methods for arsenic analysis used the reaction of arsine gas with either mercuric bromide captured on filter paper to produce a yellow-brown stain (Gutzeit method) or with silver diethyl dithiocarbamate (SDDC) to produce a red dye. The SDDC method is still widely used in developing countries. The molybdate blue spectrophotometric method that is widely used for phosphate determination can be used for As(V), but the correction for P interference is difficult. Methods based on atomic absorption spectrometry (AAS) linked to hydride generation (HG) or a graphite furnace (GF) have become widely used. Other sensitive and specihc arsenic detectors (e.g., AFS, ICP-MS, and ICP-AES) are becoming increasingly available. HG-AES, in particular, is now widely used for routine arsenic determinations because of its sensitivity, reliability, and relatively low capital cost. 

Nitric oxide bubbled slowly through diethyl phosphonate until after 3 hrs. no further increase in weight occurs diethyl phosphate. Y 90%. F. e. s. D. Samuel and B. L. Silver, J. Org. Ghem. 28, 2089 (1963). 

Forbes and Silver [40] made a systematic comparison of organic phos-phonates, phosphates and phosphinates based on the results of the 60-minute four-ball wear test under a 15 kg load at 1500 rpm. On plotting the wear data for n-butyl di-n-octylphosphinate, di-n-butyl n-hexylphosphonate, di-n-butyl phenylphosphonate, diethyl benzylphos-phonate, diethyl o-nitrophenylphosphonate and tri-n-butyl phosphate against the ionization constants of the corresponding parent acids (expressed as pK ), the solid curve of Fig. 11-10 was obtained. This led them to the hypothesis that the involvement of carbon-phosphorus bonding... 

Figure 11-10. Comparison of organic phosphates, phosphonates and phos-phinates as lubricant additives. Four-ball test 60 minutes, 15 kg load, 1500 rpm. 4 mmoles of additive per 100 gm of white oil solution. Neutral esters o. Acids or acid esters A. 1 n-Butyl di-n-butylphosphinate. 1 Di-n-hexylphosphinic acid, la Di-n-octylphosphinic acid. 2 Di-n-butyl n-hexylphosphonate. 3 Di-n-butyl phenylphosphonate. 4 Tri-n-butyl phosphate. 4 Di-n-butyl phosphate. 5 Diethyl benzyIphosphonate. 6 Diethyl o-nitrophenylphosphonate. 7 Di(2-ethylhexyl) phosphate. 8 Dilauryl phosphate. 9 Tricresyl phosphate. From data by Forbes and Silver [40] and by Forbes and Battersby [46].

Trimetaphosphate esters can be obtained by heating the silver salt with an alkyl halide (5.319), or by heating a monoalkyl phosphate with excess dicyclohexyl carbodiimide. The ethyl ester hydrolyses instantly at 0°C to give diethyl triphosphate (5.320). 

Br-Butanone-Pi. An aqueous solution (10 ml) containing 179 mg (0.025 M) of the triscyclohexylammonium salt of the diethyl ketal is swirled with 2 g of Dowex 50 (H ) to remove cyclohexylammonium ions and then filtered. The resulting acidic solution is incubated at 40 for 3 hr. At this time paper chromatography (same system as above) followed by visualization with the spray for phosphate esters" revealed an essentially complete conversion of the ketal Rf = 0.53) to the ketone (Rf = 0.23). The latter component gave an immediate positive response with a silver nitrate dip," whereas the ketal was not detected. Solutions of... 

Additives used in final products Piasticizers acetyl triethyl citrate, di-(2-ethylhexyl) phthal-ate, diethyl phthalate, dimethyl phthalate, dimethyl sebacate, dioctyi sebacate, polyethylene glycol, polypropylene glycol, sulfolane, toluenesulfonamide derivatives, tri-(2-ethylhexyl) phosphate, triacetin, tributyl citrate, triethyl citrate, triphenyl phosphate Antistatics silver-doped vanadium pentoxide, vanadium pentoxide Antiblocking hydrogenated tallow amide, laponite, silica, talc Release magnesium stearate, sodium benzoate Slip silicone oil ... 

---