Arsine phenyl

Baxter, G.P., Bezzenberger, F.K., Wilson, C.H. (1920) The vapor pressures of certain substances Chloropicrin, cyanogen bromide, methyl-dichloro-arsine, phenyl-dichloro-arsine, diphenyl-chloro-arsine and arsenic trichloride. J. Am. Chem. Soc. 42, 1386-1393. 

In the series of aromatic arsines there is a great difference in aggressive action between triphenyl arsine, phenyl dichloroarsine and diphenyl chloroarsine. 

Methyl dichloroarsine. Ethyl dichloroarsine. Chlorovinyl arsines. Phenyl dichloroarsine. Diphenyl chloroarsine. Diphenyl cyanoarsine. 

An Eisen wird 2-Nitro-benzolarsonsaure iiber die 2-Amino-benzolarsonsaure zum (2-Amino-phenyl)-arsin (bis 80% d.Th.) reduziert4. 

Amino-benzoIarsonsaure wird an Quecksilbcr unter Argon in verd. Salzsaure zum (2-Amino-phenyl )-arsin reduziert7. 

A. Preparation.—The first reverse Wittig olefin synthesis has been reported. Triphenylphosphine oxide and dicyanoacetylene at 160 °C gave the stable ylide (1 78%) the reaction was reversed at 300 °C. No comparable reaction was observed with a variety of other activated acetylenes but tri phenyl arsine oxide gave the corresponding stable arsoranes with dicyanoacetylene (— 70 °C), methyl propiolate, hexafluorobut-2-yne, dimethyl acetylene dicarboxylate, and ethyl phenylpropiolate (130 °C). 

A spectrophotometric technique showed that the isomeric vinyl phenyl dimethyl arsines reacted at similar rates in carbon tetrachloride solution, as did the isomeric allylphenyl dimethyl arsines 8). The bromination of the methiodides of the allyl compounds was studied to see if the presence of the positively charged group affected the reactivity of the... 

The compound is digested with nitric acid and the solution is analyzed for antimony by AA or ICP spectrophotometry (see Antimony). To determine the chlorine content a measured amount of substance is heated at 300°C and the liberated CI2 is passed into an acidic solution of KI and analyzed by iodomet-ric titration using a standard solution of sodium thiosulfate or phenyl arsine oxide and starch indicator. 

Chlorine gas may be identified readdy by its distinctive color and odor. Its odor is perceptible at 3 ppm concentration in air. Chlorine may be measured in water at low ppm by various titrimetry or colorimetric techniques (APHA, AWWA and WEF. 1999. Standard Methods for the Examination of Water and Wastewater, 20th ed. Washington DC American Pubhc Health Association). In iodometric titrations aqueous samples are acidified with acetic acid followed by addition of potassium iodide. Dissolved chlorine liberates iodine which is titrated with a standard solution of sodium thiosulfate using starch indicator. At the endpoint of titration, the blue color of the starch solution disappears. Alternatively, a standardized solution of a reducing agent, such as thiosulfate or phenylarsine oxide, is added in excess to chlorinated water and the unreacted reductant is then back titrated against a standard solution of iodine or potassium iodate. In amperometric titration, which has a lower detection limit, the free chlorine is titrated against phenyl arsine oxide at a pH between 6.5 and 7.5. 

Iodine in aqueous solution may be measured quantitatively by acidifying the solution, diluting it, and titrating against a standard solution of sodium thiosulfate, sodium arsenite or phenyl arsine oxide using starch indicator. The blue color of the starch decolorizes at the end point. The indicator must be added towards the end of titration when the color of the solution turns pale yellow. Prior to titration, iodine in the dilute acidic solution is oxidized to iodate by adding bromine water or potassium permanganate solution. Excess potassium iodide is then added. The liberated iodine is then titrated as above. 

The hypochlorite ion may be identified most distinctly by ion chromatography. Its concentration in the aqueous solution combined as CIO and molecular CI2 (which is partly formed when hypochlorite is dissolved in water) can be measured by iodometric titration. A measured volume of sodium hypochlorite solution is added to a small volume of an acidified solution of potassium iodide (in excess). Iodine liberated is titrated with a standard solution of sodium thiosulfate or phenyl arsine oxide using starch as indicator. Blue color of starch solution decolorizes at the end point. 

Elemental composition Na 15.34%, I 84.66%. Aqueous solution is analyzed for sodium by AA or ICP and for iodide ion by ion chromatography or leuko-crystal violent colorimetry (See Iodine). Alternatively, in an acidified solution of sodium hypochlorite, a measured amount of sodium iodide is titrated against a standard solution of sodium thiosulfate or phenyl arsine oxide using starch indicator to detect the end point. 

The complex reacts readily with ligands such as tertiary phosphines, phosphites, or arsines to give substitution of a CO ligand on the cobalt atom. With CO, however, the complex reacts to give 2-phenylindazolone and 3-phenyl-2,4 lif, 3f/)-quinazolinedione,15 whereas the reaction with CO and hexafluoro-2-butyne affords an anilinoquinoline, probably via an intermediate complex in which the alkyne and CO have inserted into the Co—C bond.16... 

C(HS )jAsCl (Ref, p 196) and Clark II, bi-phenylcyanoarsine, (CSHS )2As CN (Ref, p 199). Another Ger arsine deriv was phenyl-dibromoarsine, C6HS -AsBrj,... 

These are prepared by the cyclization of either an arsenous chloride (29) (23JCS2489) or an arsenic acid (30) (58JCS1719). These routes have been used to prepare both the 1-methyl-and the 1-phenyl-arsindolines. The arsindolines show the normal properties of tertiary arsines and form addition compounds with alkyl halides or palladium dibromide. Attempts to dehydrogenate arsindolines to the parent arsindoles (31) have not been successful (Scheme 7). 

Arsin Acid Bis-[4-fluoro-phenyl]-XII1/8. 333 (Ar-NJ + AsF8 / H,0) ElOa. 725 (At jAsFj 4... 

Dichlorophenol, AF70 Dichloro(phenyl)arsine, AG13... 

The liberated iodine is titrated against standard sodium thiosulfate or phenyl arsine oxide using starch indicator (see Section 1.6). 

The iodine liberated is stoichiometrically equivalent to the DO in the sample. It is titrated against a standard solution of Na2S203 or phenyl arsine oxide using starch indicator to a colorless end point. 

Jakubowski et al. (36) developed a GC/MS method for CVAA spiked into guinea pig urine using 1,2-ethanedithiol for derivatization, with phenyl arsine oxide as the internal standard. The same group later expanded the method to include atomic emission detection (AED) (37). CVAA was concentrated from urine (adjusted to pH 6 with 1M HC1) by SPE on Cl8. After elution with methanol and concentration to dryness, the residue was reconstituted and derivatized with ethanolic 1,2-ethanedithiol. Detection was by GC combined with arsenic selective AED and by electron impact/mass spectrometry (EI/MS) using SIM. Ions monitored were the moderately intense M+ ion at mlz 228, an intense ion [M — C2H4]+, mlz 200, and a base... 

Co—L 200 pm), PR3 (225), AsR3 (233). Few low-oxidation-state complexes have been reported and no crystal structures. The alkyl-substituted arsines of Co" are usually easily air-oxidized to Co1" complexes, but this is difficult with phenyl- and aryl-arsines. Further oxidation to Co,v does not appear to be possible. 

FVP of dihydrocyclobut[ ]arsindole 100 resulted in valence isomerization with ring opening to give 1-phenyl-l-benzarsepin-1-oxide 101. This oxide 101, on treatment with trichlorosilane, underwent deoxygenation to afford 1-phenyl-l-benzarsepin 25 w-chloropcrbenzoic acid (MCPBA) reconverted the arsine into the oxide (Scheme 16) <1994CPB2441>. 

Neurotoxic chemicals and motor neuropathy Chlorpyrifos, dichlorvos (DDVP), EPN, n-hexane, 2-hexanone, lead, lead chromate, lead II thiocyanate, leptophos, methamidophos, mipafox, omethoate, parathion, trichlor-fon, trichloronate, triorthocresyl phosphate Neurotoxic chemicals and sensorimotor neuropathy acrylamide, allyl chloride, arsenic and compounds, arsenic trichloride, calcium arsenate, carbon disulfide, dichloroacetylene, ethylene oxide, gallium arsenide, lead arsenate, mercuric chloride, mercuric nitrate, mercurous nitrate, mercury, nitrous oxide, phenyl arsine oxide, thallium and soluble compounds, thallous nitrate... 

Golub et al. have shown that zirconium(IV) and hafnium(IV) form eight-coordinate complexes in solution with NCS" alone or in the presence of DMF 329, 333). The compounds (Et4N)2[M(NCS)8] (M = Zr, Hf) both contain iV -thiocyanato groups, as determined by infrared studies, and are isomorphous 61). Benzyl phenyl arsinic acid has been used as an extractant and, unlike most systems, hafnium complexes are extracted better than zirconium complexes in the presence of NCS" 302). 

---