Boron hydrides synthesis

Safety considerations are paramount in any boron hydride synthesis. The energy yield from the oxidations of boron hydrides is too high for any cavalier treatment of boron hydrides. Exclusion of air is the critical consideration in diborane reactions. Decaborane(14) is less reactive, generally, in a kinetic sense, but the thermodynamic potential is comparable. In addition, all volatile boron hydrides are toxic. The procedures described in the latter two preparations are within our experience non-hazardous. These procedures should be followed in every detail improvisation is not recommended. 

Main Types of Polyheral Boron Hydrides. Synthesis and Properties... 

Synthesis of the complex below using a boron hydride had produced a molar solution of the complex in tetrahydrofuran that detonated after being stored at 15°C for two weeks. 

The aldehyde synthesis by hydroformylation of alkenes described in the preceding section can be achieved indirectly using boron hydrides. An oversimplified expression of this reaction is... 

As a result of the hydridic nature of the hydrogen attached to boron, amine-boranes are interesting and useful reducing agents and have been employed in the reduction of numerous organic carbonyl compounds. They have been utilized in studying the kinetics and mechanism of hydride reactions and are precursors for the synthesis of substituted boranes, borazines, boronium ions, higher boron hydrides, and carboranes. 

When I retrace my early attraction to boron hydride chemistry, Escher s poetic introspections strike a familiar note. As a student intrigued by early descriptions of the extraordinary hydrides, I had not the prescience to see the future synthesis developments nor did I have then a scientific... 

An unusual example of a designed synthesis of a previously unknown binary boron hydride is the formation of Bl2Hi6 (Fig. 5-3), the only known neutral dodeca-borane, via metal-promoted oxidative fusion of hexaborane(9) anions ... 

The heteroboranes are derived ultimately from boranes, which, in turn, can be built up from lower molecular weight boron hydrides, the simplest of which is diborane, B2H6. There are a number of industrial processes described for the synthesis of diborane, most involving the reduction of boron trihalides with metal hydrides, as shown in equation (1). Other methods involve the reduction of trihaloboranes with group 1... 

The presence of a stable diborane-like molecule [H2Ga(/x-H)]2 in both solution and the vapor phase suggests that the chemistry of gallane has a marked similarity to that of diborane, that is, (1). The analogy between the gallium and boron hydrides is extended by the synthesis and structural characterization of the mixed gallaborane, GaBHe (1). 

Asymmetric Synthesis by Homogeneous Catalysis Boron Hydrides Boron Organoboranes Hydrosilation Catalysis Rhodium Organometallic Chemistry. 

Diborane (B2H6) is a highly reactive boron hydride, which was once considered as a possible rocket fuel for the U.S. space program. Calculate AH for the synthesis of diborane from its elements, according to the equation... 

Discovery of the diammoniate of diborane (B2He, 2NH3) and bor-azene (B3N3H6), better known by its older name of borazole, by Stock (131) indicated that the boron hydrides could be used to prepare interesting boron-nitrogen compounds. This approach to boron chemistry was rapidly extended when the principles discussed in the preceding section were clearly recognized. Thus the compound (CH3)3N BH3, the first borane adduct to be characterized (39), pointed the way to the synthesis of a number of similar substances directly from diborane and amines for exam-... 

A number of reactions of the boranes lead to synthesis of boron-carbon bonds. With boron alkyls the boron hydrides undergo important alkylation reactions, but only in the case of diborane have these reactions been described in detail. When diborane is mixed with trimethylborane at room... 

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