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Diborane(6), commonly known as diborane, is the chemical compound with the formula B 2 H 6. It is a highly toxic, colorless, and pyrophoric gas with a repulsively sweet odor. Given its simple formula, borane is a fundamental boron compound. It has attracted wide attention for its electronic structure. Several of its derivatives are useful reagents.
When the alkyl group is small, such as methyl, monoalkylboranes often redistribute to mixtures of diborane and di- and trialkylboranes. One example of an isolable (bulky) primary borane is thexylborane (ThxBH 2 ), produced by the hydroboration of tetramethylethylene : [ 6 ] A chiral example is monoisopinocampheylborane, obtained by ...
Diborane(2), also known as diborene, is an inorganic compound with the formula B 2 H 2. The number 2 in diborane(2) indicates the number of hydrogen atoms bonded to the boron complex. There are other forms of diborane with different numbers of hydrogen atoms, including diborane(4) and diborane(6) .
The structure of diborane was correctly predicted in 1943 many years after its discovery. [3] Interest in boranes increased during World War II due to the potential of uranium borohydride for enrichment of the uranium isotopes and as a source of hydrogen for inflating weather balloons.
The complex is commercially available but can also be generated by the dissolution of diborane in THF. Alternatively, it can be prepared by the oxidation of sodium borohydride with iodine in THF. [2] The complex can reduce carboxylic acids to alcohols and is a common route for the reduction of amino acids to amino alcohols [3] (e.g. valinol).
In organic chemistry, carbonyl reduction is the conversion of any carbonyl group, usually to an alcohol. It is a common transformation that is practiced in many ways. [ 1 ] Ketones , aldehydes , carboxylic acids , esters , amides , and acid halides - some of the most pervasive functional groups , -comprise carbonyl compounds.
The -BH 2 group consists of an extra B-H bond formed on the BH units and is thus considered to take up two orbitals and two valence electrons. The bonding structure deduced by the styx rule doesn't reflect the true symmetry of boranes. [ 2 ]
In the case of using benzyldimethylsilane as a directing group it is proposed that benzyldimethylsilane reacts with the trisboryl iridium catalyst through reversible addition of the Si-H bond to the metal center, followed by selective ortho-C–H bond activation via oxidative addition and reductive elimination.