Arsonic acids, aryl

Aryl Arsonic Acid Aryl Boronate Aryl Bromide... 

Aryl arsonic acids can be made from a diazonium salt by the Bart reaction ... 

Bart reaction (org chem( Formation of an aryl arsonic acid by treating the aryl diazo... 

Reduction with sodium dithionite has been used for conversion of aryl arsonic and aryl stibonic acids to arsenobenzenes [260] and stibinobenzenes in good yields [261]. 

HPLC units have been interfaced with a wide range of detection techniques (e.g. spectrophotometry, fluorimetry, refractive index measurement, voltammetry and conductance) but most of them only provide elution rate information. As with other forms of chromatography, for component identification, the retention parameters have to be compared with the behaviour of known chemical species. For organo-metallic species element-specific detectors (such as spectrometers which measure atomic absorption, atomic emission and atomic fluorescence) have proved quite useful. The state-of-the-art HPLC detection system is an inductively coupled plasma/MS unit. HPLC applications (in speciation studies) include determination of metal alkyls and aryls in oils, separation of soluble species of higher molecular weight, and separation of As111, Asv, mono-, di- and trimethyl arsonic acids. There are also procedures for separating mixtures of oxyanions of N, S or P. 

In the Rosenmund synthesis salts of arsonic acids are obtained by treatment of aryl halides with sodium or potassium arsenite.8... 

Arsonic acid general formula RAsO(OH)2, where R is an alkyl or aryl group... 

Zinc amalgam reduction of PhMeAsOjH yields PhMeAsH. Reduction of the arsonic acid function, without attack on the substituted aryl ring, yields p-MeC H jAsH ... 

D. Reduction of Arsonic Acids, RAsO(OH)2, R = Alkyl, Aryl.. 466... 

Spirocyclic structures (98) have been assigned to the esters produced from glycols and aryl- or alkyl-arsonic acids.672... 

Rosenmund reaction. Formation of aromatic arsonic acids by heating equimolar amounts of sodium or potassium arsenite with aryl halides in aqueous solution. The reaction is an extension of the Meyer reaction. 

One of the principal syntheses of the pharmacologically interesting aryl-arsonic acids is provided by treatment of arenediazonium chlorides with sodium arsenites (the Bart reaction), e.g. ... 

The reaction of 1,2-xylylenedithiol with ar enic(III) halides and various dialkyl esters of aryl-arsonic acids under anhydrous conditions gives the corresponding halo- or aryl-substituted dithi-arsepins (112), respectively <88izvi82>. As found for the analogous dioxarsepins, halo substituents reduce conformational lability. 

Amines, polymeric, immobilization of the Cu(II) complexes, 134 Arsonic acid, polymer-bound, generated, 139 Aryl ethers, formation with Nafion, 51t... 

With aryl arsonic acids Ni(C6H5-As03)H20 293.2 14.57 4161 c. 3.13 30 Gouy distorted octahedral 72S9, 71S8... 

Baeyer-Villiger oxidation of alkyl- and aryl-substituted C -C, cycloalkanones, steroid ketones and branched chain aliphatic ketones is catalysed by arsonated polystyrene resins [53], Larger size cycloalkanones and linear ketones react much slower. Water miscible and immiscible solvents can be used. With the latter, the resin behaves as an effective catalyst and a phase-transfer agent (triphase catalysis). The same compounds are also epoxidation catalysts. More recently, a method for the preparation of phenols by the oxidation of aromatic aldehydes and ketones has been reported. The most convenient catalysts are nitro-substituted arylseleninic acids and corresponding diselenides [54]. 

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