Boron arsenate

Arsenic and Boron. Arsenic and boron form volatile fluorides which are difficult to separate from high purity HF. Special equipment and techniques must be used to remove the arsenic. 

Synthesis of Enamines Utilizing Various Compounds of Phosphorus Titanium, Boron, Arsenic, and Mercury. ... 

In this section, syntheses of a variety of inorganic nitrogen compounds are described. The syntheses include those of triazanium chlorides alkylamino derivatives of boron, arsenic, and tin and trimeric and tetrameric boron-nitrogen ring structures as exemplified by borazine (HNBH)3. 

Explosion Hazard The volatile hydrides (such as hydrides of boron, arsenic, phosphorus, selenium, tellurium) form explosive mixtures with air. 

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... 

B. About 20 elements are called minerals. They also play a role in human nutrition. The minerals known to be essential for good health are calcium, phosphorus, potassium, sulfur, sodium, chlorine, magnesium, iron, manganese, copper, iodine, cobalt, fluorine, and zinc. Traces of sihcon, boron, arsenic, strontium, aluminum, bromine, molybdenum, selenium, and nickel may also be required. These elements are eaten in the form of their compounds, but it does not matter much which compounds. 

The chemistry of boron-phosphorus compouuds has been reviewed. Numerous boron-phosphorus derivatives have been reported, but relatively few boron-arsenic or boron-antimony compounds have been described. Boron-phosphorus compounds are similar in many ways to boron nitrogen derivatives, but the teudeucy to share boudiug electrons in covalent tetrahedral compounds is much more evident with phosphorus thau with uitrogeu. lu fact, most boron phosphorus chemistry iuvolves tetrahedral borou. They are typically either phosphiue-boraue complexes, such as R3P BR j, or phosphinoboranes (R2PBR2) , cyclic or polymeric derivatives of the hypothetical H3P BH3. The chemistry of these compounds and that of boron phosphate and thiophosphate is described below. Boron phosphides are discussed in Section 2.6. 

Ferrocene analogs that possess a heteroatom in place of one carbon atom have been known for some time. The most common of these heteroferrocenes are the azaferrocenes and the phosphaferrocenes, though complexes having snlfur, boron, arsenic, antimony, bismuth, and nickel atoms are known. Review articles that are either comprehensive (in the case of phosphaferrocenes), or cover aspects of this chemistry (in the case of azaferrocenes), are available space restrictions for this review do not permit complete coverage of these areas. Instead, recent developments in the area of planar chiral heteroferrocenes, especially as it relates to asymmetric catalyst design, will be the primary focus here. 

Finally, it is interesting to note that the relation between the global mobility of trace elements in the aquatic system (Figure 2) and the speciation patterns summarized above is not direct. Although most of the fully hydrolyzed species appear as mobile elements (phosphorus, carbon, rhenium, boron, arsenic, molybdenum), some elements in this family are amongst the least mobile elements... 

C. Reactions Leading to Formation of Boron-Phosphorus, Boron-Arsenic, or... 

In the determination of the trace elements, selenium, beryllium, boron, arsenic, and vanadium, all of the methods studied were found to be acceptable. 

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