Arsenates phenyl—

The sapphyrin-modified silica gels also proved effective for HPLC separation of various anions other than phosphates, but not neutral or cationic species. For instance, various monoanionic species such as diphenyl phosphate, benzene sulfonic acid, phenyl arsenate, phenyl phosphate, and benzoate could all be separated from each other. Nucleotide mono-, di-, and triphosphates such as AMP, ADP, and ATP were also retained on these columns and were found to be readily separable from one another under isochratic HPLC conditions. Likewise, in what is still unpublished work, it has been found that these columns can be used to separate... 

Product studies in certain buffers of various concentrations furthermore demonstrate that the decomposition of the neutral tetrahedral intermediate TH from N-phenyliminotetrahydrofuran to aniline and butyrolactone, is general acid-base catalyzed (without affecting the rate of disappearance of the substrate) (Cunningham and Schmir, 1966). Effective buffers are acetate, phosphate, bicarbonate, arsenate, phenyl-phosphate, and 3,3-tetramethyleneglutaric acid ineffective buffers are tris-(hydroxymethyl)-aminomethane, imidazole andp-nitrophenol. The capability of the effective buffers, which are all bifunctional, can be attributed to a cyclic internal acid-base catalyzed decomposition of the neutral intermediate TH (transition state 16). 

Stibonic and Stibinic Acids. The stibonic acids, RSbO(OH)2, and stibinic acids, R2SbO(OH), are quite different in stmcture from their phosphoms and arsenic analogues. The stibonic and stibinic acids are polymeric compounds of unknown stmcture and are very weak acids. lUPAC classifies them as oxide hydroxides rather than as acids. Thus CgH3SbO(OH)2 is named phenyl antimony dihydroxide oxide [535-46-6], the Chemical Abstracts n.2ixn.e is dihydroxyphenylstibine oxide [535-46-6], CgH OgSb. 

A detailed study of the radiochemical reactions of phenylarsenic compounds has been published by Grossmann. Once again unable to effect isolation of all compounds, he was able, however, to get evidently reliable values for the sums of all compounds with one, two and three phenyl-arsenic bonds, respectively, as well as ionic arsenic and a further organic-soluble fraction which appeared to be a group of polymeric phenylarsenic compounds. Selected data from this work are given in Table 6. 

Both phenyl radicals and arsenic-containing radicals seem to be involved. Both can be scavenged by oxygen present either in the atmosphere or in the compound itself. 

Tris(a-hydroxy-/3,/3,/3-trichloroethyl)phosphine reacts with phenyl-trichlorosilane, phosphorus, and arsenic trichlorides in the same way, giving bicyclic product (14) [Eq. (12)] (78ZOB2437). 

Bei der Umsetzulig von Zimlaldehyd mit Salpetersaure/Arsen(III)-oxid wird 4-Nitro-3-phenyl-furazan-2-oxid als Nebenprodukt erhalten248. 

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). 

The nature of the bonding in some stable arsonium and phosphonium ylides (Ph3X=CHCOR R = alkoxy, Ph X = P, As) was studied by photoelectron spectroscopy (19). The data showed a partial positive charge on phosphorus and arsenic and little change in the charge on the heteroatoms by changing R from alkoxy to phenyl. 

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