Silicon-arsenic compounds

Keywords Silicon-Phosphoms Compounds / Silicon-Arsenic Compounds / Silylidene-phosphanes and -arsanes / Silaheterocycles / Allyl Analogues... 

On the other hand, Driess et al. have succeeded in the synthesis and isolation of a stable silicon-arsenic double bond compound (13), the first stable arsasi-lene (arsanilidenesilane),19 and they found that the arsasilene 13 undergoes ready... 

This rule holds for all compounds containing carbon, hydrogen, oxygen, nitrogen, sulfur, and the halogens, as well as many of the less usual atoms such as phosphorus, boron, silicon, arsenic, and the alkaline earths. 

There is some evidence that chromium Cr " ), silicic acid (SitOH) ) or related silicon-based compounds, borate nickel and arsenate (AsO ) are... 

There is some evidence that chromium (Cr " ), silicic acid (Si(OH)4) or related silicon-based compounds, borate (8407 ), nickel (NP" ), and arsenate (AsOf ) are required inorganic nutrients. However, the available evidence tends to be not convincing to all researchers (Reeves, 1997). The functions of arsenate and nickel are not clear. There is some indication that arsenate is used in the metabolism of sulfur-containing amino acids. An experimentally induced deficiency in arsenate or nickel results in impaired growth. 

Summary The preparation of two novel silicon-arsenic cages with a bicycloheptane structure (1) and a tricyclononane structure (2) is described. Furthermore we report the synthesis of a new anionic silicon-phosphorus cage with a bicyclooctane skeleton (3). Its reaction with chlorotrimethylsilane gives 4. X-ray stractures and NMR data of all newly synthesized compounds are presented. 

Metastable Compounds Containing Silicon-Phosphorus and Silicon-Arsenic Multiple Bonds Syntheses, Structures, and Reactivity... 

Kabouche and coworkers. Finally Rezanka and coauthor present a comprehensive review on biologically active compounds of semi-metals such as boron, silicon, arsenic, selenium and tellurium. 

Unlike cyclic silicon-phosphorus compounds, which occur as dimers and/or trimers, the cyclic silicon-arsenic ring of (Me2SiAsMe)4 is eight-membered. It results from MeAsHLi and Me2SiCl2 along with polymer, and occurs in solution as a mixture of conformers (equation 90)no. 

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