Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Arsenic—hydrogen bonds reactions with

At 170 °C and less than 12 bar of hydrogen, AsPhj reaction with Ni/AljOj can be broken down into two steps. The first is fast and leads to the iU-crystalUzed NiAso.45 bimetallic nanoparticles its rate is Umited by the diffusion of arsenic atom into the metallic particles. The second, much slower, leads to weU-crystalUzed NiAs nanoparticles of alloy. Its rate is Umited by the hydrogenolysis of the As-Ph bond. The reaction mechanism can be represented by Scheme 18.9. [Pg.576]

Trialkyl- and triarylarsine sulfides have been prepared by several different methods. The reaction of sulfur with a tertiary arsine, with or without a solvent, gives the sulfides in almost quantitative yields. Another method involves the reaction of hydrogen sulfide with a tertiary arsine oxide, hydroxyhahde, or dihaloarsorane. X-ray diffraction studies of triphenylarsine sulfide [3937-40-4], C gH AsS, show the arsenic to be tetrahedral the arsenic—sulfur bond is a tme double bond (137). Triphenylarsine sulfide and trimethylarsine sulfide [38859-90-4], C H AsS, form a number of coordination compounds with salts of transition elements (138,139). Both trialkyl- and triarylarsine selenides have been reported. The trialkyl compounds have been prepared by refluxing trialkylarsines with selenium powder (140). The preparation of triphenylarsine selenide [65374-39-2], C gH AsSe, from dichlorotriphenylarsorane and hydrogen selenide has been reported (141), but other workers could not dupHcate this work (140). [Pg.338]

In the reaction with halides of the less electropositive metals such as mercury,79 arsenic,80- 81 antimony,82 and indium,83 a stannane provides nucleophilic hydrogen and gives the new metal hydride (equation 15-27). Free radical inhibitors may be added to repress radical reaction of vinyl reactants. The preparation of vinylmercury hydride by this route involves the unusual use of tributyltin chloride as a solvent (equation 15-28).79 On the other hand, in the reactions of tributyltin hydride with Grignard reagents, RMgX, the hydrogen behaves as an electrophile towards R, and the Sn-Mg bonded compounds are formed.84... [Pg.253]


See other pages where Arsenic—hydrogen bonds reactions with is mentioned: [Pg.86]    [Pg.36]    [Pg.24]    [Pg.35]    [Pg.163]    [Pg.478]    [Pg.478]    [Pg.1702]    [Pg.324]    [Pg.338]    [Pg.16]    [Pg.299]    [Pg.409]    [Pg.258]    [Pg.1696]    [Pg.189]    [Pg.479]    [Pg.461]   


SEARCH



Arsenic reactions

Arsenic reactions with

Arsenic—hydrogen bonds

Bonds with hydrogen

Hydrogen arsenate

Hydrogenation reaction with

Reaction with hydrogen

© 2024 chempedia.info