Trimethyl arsine

Arsine, trifluorohaloethylenebis(dimethyl-, 2, 1006 Arsine, trimethyl-, 2, 1005,1006 oxide... 

Trimethyl arsine [593-88-4] C H As, has been identified as the toxic volatile arsenical, once known as "Gosio gas," produced by the reaction of certain molds that grow on wallpaper paste and react with inorganic arsenic compounds present in the paper. A number of microorganisms can methylate arsenic trioxide and other arsenic-containing compounds to yield trimethylarsine. These microorganisms include Scopulariopsis brevicaulis Candida humicola and Gliocladium roseum (72). 

If trimethyl gallium is mixed widi arsine, ASH3, the hydrogen atoms released by the dissociation of this gas react with the methyl radicals released from gallium trimediyl according to the equation... 

Manasevit A process for making electronic devices by depositing thin films of elements or simple compounds such as gallium arsenide on flat substrates by CVD from volatile compounds such as trimethyl gallium and arsine. 

The reaction of toluene solutions of indium trichloride and tris(trimethylsilyl)arsine resulted in the formation of a very fine dark-brown powder subsequently annealed up to 400°C to drive to completion the elimination of trimethyl-silyl-chloride. Nanocrystalline InAs was obtained. Similar reactions with InBr3 and Inl3 and P compounds have been discussed. Previously a similar reaction was described by Uchida et al. (1993) (reaction of indium acetylacetonate with tris(trimethylsilyl)arsine in refluxing triglyme). Subsequently the reaction with InCl3 was used by Guzelian et al. (1996) in the preparation of nano-crystal quantum dots. They compared different preparation methods and techniques useful to isolate specific size distributions. 

An alternative to gallium vapour is an organometallic compound of gallium. One preparation reacts trimethyl gallium (Ga (0113)3) with the highly volatile (although toxic) arsine (AsHs). 

According to Challenger (127), arsenate is transformed to trimethyl-arsine by the mold Scopulariopsis brevicaulis, by sequential reduction and oxidative methylation of the arsenic species (Fig. 7). The proposed intermediates in the pathway were MMA, DMA, and TMAO. Although Challenger could not detect these compounds, when they were added to a culture of S. brevicaulis trimethylarsine was formed. Challenger (129) considered that the likely source of methyl groups was S-adeno-sylmethionine (AdoMet), which had previously been identified as an... 

Cationic methylplatinum(II)-nitrile complexes of the type m is-PtMeL2(NCR)+X have been isolated by the reaction of //vms-PtMeClL2, where L = dimethylphenylphosphine or trimethyl-arsine, with an aryl nitrile and AgX, where X = BF4, PF. Use of pentafluorobenzonitrile and 2,3,5,6-tetrafluorotetraphthalonitrile in alcohol has led to the synthesis of a series of imino ether complexes. A mechanism for imino ether formation, involving nucleophilic attack by an alcohol at a coordinated nitrile, is suggested and the course of the reaction is shown to be dependent not only on the alcohol but also on the size of the anion used.110... 

At 100 °C pentamethylarsorane (/) is quantitatively decomposed to trimethyl-arsine, methane and a little ethylene, thus supporting the assumption of intermediate formation of ylide 148 ethane is only formed in traces131). With water and acids tetramethylarsonium salts are produced m) whereas with alcohols, hydroxylamines and oximes covalent pentacoordinate arsoranes 149 are obtained in which one methyl group has been replaced by the respective electronegative group Y 132,133). 

Four arsenic species common in natural samples are arsenate, arsenite, methanearsonic acid (MMAA) and dimethylarsinic acid (DMAA). These species possess different chemical properties which affect the mobility of arsenic in natural systems. For example, methanobacteriurn form trimethyl arsine from DMAA faster than fromMMAAor arsenate 3) and arsenate and MMAA are more strongly adsorbed than DMAA on alluvial soils ( ). Transformation between the different oxidation states and species of arsenic may occur as a result of chemical or biochemical reactions (J, 2, 7, 9). Inorganic chemical... 

Cox, D.P. and Alexander, M. Production of trimethyl arsine gas from various arsenic compounds by three sewage fungi. 

ARSINE, OXO(4-CARBOXY)PHENYL- see CCI550 ARSINE SELENIDE, TRIMETHYL- see TLH250 ARSINE SULFIDE, DIMETHYLDI- see DQG700... 

Andreae described a method for the sequential determination of arsenate, arsenite, mono-, di- and trimethyl arsine, MMAA, DMAA and trimethylarsine oxide in natural waters with detection limits of several ng/1. The arsines are volatilized from the sample by gas stripping the other species are then selectively reduced to the corresponding arsines and volatilized. The arsines are collected in a cold trap cooled with liquid nitrogen. They are then separated by slow warming of the trap or by gas chromatography, and measured with atomic absorption, electron capture and/or flame ionization detectors. He found that these four arsenic species all occurred in natural water samples. 

CrAs07PC25H24, Chromium, tetracar-bonyl(trimethyl phosphite)(triphenyI-arsine)-, trans-, 23 38... 

Biomethylation. Methylation and methyl transfer are important reactions in the organic metabolism of organisms (Mudd, 1973) and it has been known for some time that dimethyl selenide, dimethyl telluride and di- and trimethyl arsine are biosynthetic products of the metabolism of inorganic compounds selenium, tellurium and arsenic, respectively, by microorganisms (Challenger, 1951). 

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