B2H6 DIBORANE

With this as introduction, let us now look at the individual steps in more detail for the case of hydroboration-oxidation of 1-decene. A boron hydride that is often used is dibomne (B2H6). Diborane adds to 1-decene to give tridecylborane according to the balanced equation ... 

Complexes with Electrophiles An ether s nonbonding electrons also stabilize borane, BH3. Pure borane exists as a dimer called diborane, B2H6. Diborane is a toxic, flammable, and explosive gas, whose use is both dangerous and inconvenient. Borane forms a stable complex with tetrahydrofuran. The BH3 THF complex is commercially available as a 1 M solution, easily measured and transferred like any other air-sensitive liquid reagent. The availability of BH3 THF has contributed greatly to the convenience of hydroboration (Section 8-7). 

When magnesium is heated with boron, the product is magnesium boride, MgB2 (sometimes written as Mg3B2). The hydrolysis of the compound produces Mg(OH)2 and a boron hydride. Instead of the expected product of BH3, borane, the product is B2H6, diborane. 

B2H6 DIBORANE 19.984 1.7067E-01 -6.8997E-05 1.2108E-08 -7.6892E-13 100 6000 gas... 

With three valence electrons, each group 13 element might be expected to form a hydride MH3. Although the existence of BH3 has been established in the gas phase, its propensity to dimerize means that B2H6 (diborane(6), 12.1) is, in practice, the simplest hydride of boron. 

LiH (lithium hydride) ionic compound BeH2 (beryllium hydride) covalent compound B2H6 (diborane, you aren t expected to know that name) molecular compound CH4 (methane, do you know that one ) molecular compound NH3 (ammonia, you should know that one) molecular compound H2O (water, if you didn t know that one, you should be ashamed) molecular compound HF (hydrogen fluoride) molecular compound. LiH and BeH2 are solids, B2H6, CH4, NH3, and HF are gases, and H2O is a liquid. 

HBR 2 may be BHj (B2H6 = diborane) or other borane derivatives (see below). 

Complexes with Electrophiles An ether s nonbonding electrons also stabilize borane, BH3. Pure borane exists as a dimer called diborane, B2H6. Diborane is a toxic, flammable, and explosive gas, whose use is both dangerous and inconvenient. Borane... 

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