Arsenic boron halides

In reactions with metal or metalloidal halides, primary amines, because of their difunctionality, tend to yield more complex molecules, such as cyclic, cage, or polymeric structures. For example, cage-type structures of the type P4(NCH3)e and As4(NCH3)e have been prepared by methylaminolysis of phosphorus(III) or arsenic(III) chloride, respectively, and cyclic structures of formula (HNBC1)3 or (RBNC1)4 have been prepared from boron halides and ammonium chloride or mono-alkylamines. 

Ion implantation [15] forces ions of dopant into the silicon using a stream of high energy ions produced in a machine similar to a mass spectrophotometer. Sources of dopants for this process are elemental arsenic and phosphorus, arsine, phosphine, diborane, and some boron halides. A more detailed description of doping procedures is beyond the scope of this text and can be found elsewhere [8]. 

Aminolysis of the corresponding halides is the preferred method for the synthesis of dialkylamino derivatives of boron,1 silicon,2 germanium,3 phosphorus,4 arsenic,5 and sulfur.6 (Dialkylamino) chlorosilanes are prepared stepwise by the reaction of silicon tetrachloride with dialkylamines. This method may be utilized equally well for the conversion of alkyl- or aryl-substituted halides [e.g., (CH3) SiCl4. ] or of oxide and sulfide halides (e.g., POCl3 or PSC13) to the corresponding dialkylamino compounds. 

The halides, GaQs, AlBrs, A1C13, and FeCl3, very probably also exist in dimeric form. With these halides, however, the complexation reaction with the azide is the fast step so that no square-root term is found in the kinetic equation. Arsenic trichloride, arsenic tribromide, phosphorus trichloride, and phosphorus pentachloride were without effect on the rate of decomposition of benzoyl azide. Finally, the authors have observed that the catalytic influence of boron tribromide was much higher than all the other halides. Its rate constant was estimated to be about 18 times larger than that for gallium chloride. 

Stannoles differ significantly from other group 14 metalloles in their ability to undergo exchange reactions with boron, arsenic or antimony halides. Boroles563,76, arsoles and... 

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