Phenyl phosphoric acid

The extractant is a commercial mixture of mono- and dioctyl phenyl phosphoric acid (OPPA). It is used in conjuction with tributyl phosphate (TBP). Stripping is by ammonium carbonate solution. The mixture shows synergism. Uranium is extracted in the tetravalent state. The process is much less expensive and possesses a higher extracting power than D2EHPA-TOPO combination. 

Since A,A -disubstituted hydrazines are readily available from a variety of sources (see Volume I, Chapter 14), their dehydrogenation constitutes a widely applicable route to both aliphatic and aromatic azo compounds. Such oxidative procedures are of particular value in the aliphatic series because so many of the procedures applicable to aromatic compounds, such as the coupling with diazonium salts, have no counterpart. The oxidation reactions permit the formation not only of azoalkanes, but also of a host of azo compounds containing other functional groups, e.g., a-carbonyl azo compounds [83], a-nitrile azo compounds [84], azo derivatives of phosphoric acid [85], phenyl-phosphoric acid derivatives [86],... 

Other extractants, such as mono(2-ethylhexyI)phosphoric add, mono [p( 1,1,3,3-tetramethylbutyl)phenyl] phosphoric acid and an isooctyl pyrophosphate [66] of unknown composition have been used in the separation process. 

A photocuring technique based on an acrylate matrix has thus been employed to fabricate calcium and potassium electrodes which dispenses with the volatile casting solvent, e.g. tetrahydrofuran (64,79). Thus, the calcium salt of bis-[4-(l, l,3,3-tetramethylbutyl)phenyl]phosphoric acid (6 mass %) DOPP (18 mass %) Ebecryl 150-bisphenol A type epoxyacrylate (42 mass %) 1,6-hexanedioldiacrylate (26 mass %) and Uvecryl P36-copolymerizable benzophenone photoinitiator (8 mass %) were photolysed with a mercury lamp. Calcium ISEs with Nernstian slopes of 29.7 mV decade" were fabricated from the resultant clear, flexible, thin (0.1 mm) films (79). This procedure, which is unsuitable for a sensor or mediator absorbing in the ultraviolet, could find significant application in the realm of ISFET fabrication (64,79). 

Singh, H., Vijayalakshmi, R., Mishra, S.L. Gupta, C.K. (2001) Studies on uranium extraction from phosphoric acid using di-nonyl phenyl phosphoric acid-based synergistic mixtures. Hydrometallurgy, 59, 69-76. 

Biswas, S., Pathak, P.N. Roy, S.B. (2012) Carrier facilitated transport of uranium across supported liquid membrane using dinonyl phenyl phosphoric acid and its mixture wifli neutral donors. Desalination, 290, 74-82. 

Imidazole-5-thione, 4,4-diphenyl-tautomerism, 5, 368 3 H-Imidazole-2-thione, 1,3-dimethyl-structure, 5, 367 Imidazole-2-thiones acidity, 5, 367 betaines, 5, 372 synthesis, 5, 481 tautomerism, 5, 367 3H-Imidazole-2-thiones synthesis, 5, 473, 6, 992 Imidazolides deacylation, 5, 453 mass spectra, 5, 360 phosphoric acid reactions, 5, 454 reactions, 5, 451-453 Imidazolidine, l-alkyl-3-phenyl-N-oxidation, 5, 427 Imidazolidine, 1,3-benzyl-2-phenyl-oxidation, S, 427... 

Phenyl isothiocyanate has been prepared from thiocarbanilide by the action of phosphorus pentoxide, hydrochloric acid, iodine, phosphoric acid, acetic anhydride, and nitrous acid. It has also been prepared from ammonium phenyl dithiocarbamate by the action of ethyl chlorocarbonate, copper sulfate lead carbonate, lead nitrate, ferrous sulfate,and zinc sulfate. ... 

Amongst heat stabilisers are copper salts, phosphoric acid esters,phenyl-3-naphthylamine, mercaptobenzothiazole and mercaptobenzimidazole. Of these, copper salts in conjunction with halides have been found particularly effective, and some automotive specifications require the use of copper for heat stabilisation. Light stabilisers include carbon black and various phenolic materials. 

Novolacs are usually made under acidic conditions. Oxalic, sulfuric, toluene sulfonic, phenyl sulfonic, methane sulfonic, hydrochloric, and phosphoric acids are the most common catalysts, though nearly any moderately strong acid will probably do. Often selection of the acid has significant effects on the resultant polymer structure or performance. Sometimes acids are selected for their volatility, as it may be necessary to distill the acid off in some processes. 

PHOSPHORIC ACID, DIMETHYL 4-(HETHYLTHI0)PHENYL ESTER 3018 3254-63-5... 

Phosphoric acid, dimediyl 4-(methylthio) phenyl ester 500 500... 

It yields a phenylurethane if it is heated almost to boiliog-point with phenyl-isocyanate. This compound melts, at 106° to 107°. On dehydration with phosphoric acid it yields the sesquiterpene cedrene. The relationship between cedrene and cedrol is probably as follows —... 

B. Solvolysis of Phosphoric Acid Derivatives.—Interest continues in neighbouring-group participation in the solvolysis of phosphate esters. As a potential model compound for investigating the mechanism of ribo-nuclease action, the phenyl hydrogen phosphate ester of c/j-3,4-tetrahydro-furandiol (24) has been the subject of a detailed study. Above (and probably also below) pH 4 hydrolysis gives solely the cyclic phosphate (25)... 

Friedel-Crafts alkylation can occur intramolecularly to form a fused ring. Intramolecular Friedel-Crafts reactions provide an important method for constructing polycyclic hydrocarbon frameworks. It is somewhat easier to form six-membered than five-membered rings in such reactions. Thus, whereas 4-phenyl-1-butanol gives a 50% yield of a cyclized product in phosphoric acid, 3-phenyl-1-propanol is mainly dehydrated to alkenes.43... 

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