Borane ammoniate, which is produced by a displacement reaction of other borane adducts, eliminates elemental hydrogen on heating to give borazine (HBNH) 3. [12] Borane adducts are widely used in organic synthesis for hydroboration, where BH 3 adds across the C=C bond in alkenes to give trialkylboranes: [13] (THF)BH 3 + 3 CH 2 =CHR → B(CH 2 CH ...

2023年6月30日 · Synthesis of Boranes. Diborane can be synthesized by an exchange reaction (metathesis) of a boron halide with \(\ce{LiAlH4}\) or \(\ce{LiBH4}\) in ether, for example: \[\ce{3 LiAlH4 + 4 BF3 -> 2 B2H6 + 3 LiAlF4} \nonumber \] The reaction has to be done under vacuum or with exclusion of air, because diborane burns in contact with air.

Borane-based reagents are now widely used in organic synthesis. Brown was awarded the Nobel Prize in Chemistry in 1979 for this work. [4] Most boranes are prepared directly or indirectly from diborane. Diborane reacts with alkenes to give alkylboranes, a process known as hydroboration:

This system enables the synthesis of ortho-, meta-, and para-substituted electron-rich and -deficient arylboronates. A temperature of 120°C was required for the conversion of electron-rich aryl chlorides.

Borane, any of a homologous series of inorganic compounds of boron and hydrogen or their derivatives. The boron hydrides were first systematically synthesized and characterized during the period 1912 to roughly 1937 by the German chemist Alfred Stock.

Zhou and McNulty now report a simple, general, economical and high-yielding (80-100%) synthesis of phosphine-borane complexes 2 using solid sodium borohydride as the borane source (Tetrahedron Lett. 2004, 45, 407. DOI: 10.1016/j.tetlet.2004.11.106). These phosphine-borane complexes can be used in the synthesis of soluble hindered phosphine ...

2021年4月13日 · Our results show that the borane-evolution PV method is a valid alternative to the method involving the use of borane–THF or borane–Me 2 S complex as a borane source. The PV method can be applied to many organic synthesis reactions.

Solid amidophosphine boranes were synthesized to replace more commonly used borane reagents. These compounds demonstrated excellent reactivity and functional group tolerance toward a wide variety of nitriles, alkynes, and carboxylic acids, affording the corresponding ammonium salts, alkenes, and alcohols in good yield.

Boranes are most commonly used in the hydroboration of alkenes, which is one of the most versatile and useful chemical synthesis reactions. Borane also inhibits the formation of aldehydes, ketones, lactones, epoxides, acids, tertiary amides, and nitriles, but not esters.

Borane is a special chemical compound of boron and hydrogen, with physical properties similar to alkanes. It can be classified into different types based on the number of boron and hydrogen atoms it contains, and it is widely used in organic synthesis. AI generated definition based on: Fundamentals and Applications of Boron Chemistry, 2022