Search results
Results from the WOW.Com Content Network
Disiamylborane (bis(1,2-dimethylpropyl)borane) is an organoborane with the formula [((CH 3) 2 CHCH(CH 3)) 2 BH] 2 (abbreviation: Sia 2 BH). It is a colorless waxy solid that is used in organic synthesis for hydroboration–oxidation reactions. Like most dialkyl boron hydrides, it has a dimeric structure with bridging hydrides.
Boron-boron multiple bonds are rare, although doubly-bonded dianions have been known since the 1990s. [20] Neutral analogues use NHC adducts, such as the following diborane(2) derivative: [21] [22] Each boron atom has an attached proton and is coordinated to a NHC carbene. [23] [24] A reported diboryne is based on similar chemistry. [25]
Borane dimethylsulfide (BMS) is a complexed borane reagent that is widely used for hydroborations. [4] Much of the original work on hydroboration employed diborane as a source of BH 3. Usually however, borane dimethylsulfide complex BH 3 S(CH 3) 2 (BMS) is used instead. [5] It can be obtained in highly concentrated forms. [6]
A borane is a compound with the formula BR x H y although examples include multi-boron derivatives. A large family of boron hydride clusters is also known. In addition to some applications in organic chemistry , the boranes have attracted much attention as they exhibit structures and bonding that differs strongly from the patterns seen in ...
Thexylborane is a borane with the formula [Me 2 CHCMe 2 BH 2] 2 (Me = methyl). The name derives from "t-hexylborane" (although the group is not the standard tert-hexyl group), and the formula is often abbreviated ThxBH 2. A colorless liquid, it is a monoalkylborane. It is produced by the hydroboration of tetramethylethylene: [1]
Borane makes a strong adduct with triethylamine; using this adduct requires harsher conditions in hydroboration. This can be advantageous for cases such as hydroborating trienes to avoid polymerization. More sterically hindered tertiary and silyl amines can deliver borane to alkenes at room temperature. Borane(5) is the dihydrogen complex of
Diisopinocampheylborane was originally prepared by hydroboration of excess α-pinene with borane, [2] but it is now more commonly generated from borane-methyl sulfide (BMS). [3] The compound can be isolated as a solid, but because it is quite sensitive to water and air, it is often generated in situ and used as a solution.
In organic synthesis, the complex diethylaniline·borane (DEANB) is used as a reducing agent. [4] Diethylaniline and dimethylaniline are both used as acid-absorbing bases. The advantage to the diethyl derivative is that [C 6 H 5 NEt 2 H]Cl is non-hygroscopic, in contrast to [C 6 H 5 NMe 2 H]Cl. [5]