Search results
Results from the WOW.Com Content Network
Industrially, triethylborane is used as an initiator in radical reactions, where it is effective even at low temperatures. [1] As an initiator, it can replace some organotin compounds. It reacts with metal enolates , yielding enoxytriethylborates that can be alkylated at the α-carbon atom of the ketone more selectively than in its absence.
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 ...
where the Et stands for ethyl. The trimethyloxonium salt is available from dimethyl ether via an analogous route. [6] These salts do not have long shelf-lives at room temperature. They degrade by hydrolysis: [Et 3 O] + [BF 4] − + H 2 O → Et 2 O + EtOH + H + [BF 4] −. The propensity of trialkyloxonium salts for alkyl-exchange can be ...
These chemical compounds combine boron and carbon; typically, they are organic derivatives of borane (BH 3), as in the trialkyl boranes. [1] [2] Organoboranes and -borates enable many chemical transformations in organic chemistry — most importantly, hydroboration and carboboration.
Trimethyl borate is a popular borate ester used in organic synthesis. Borate esters form spontaneously when treated with diols such as sugars and the reaction with mannitol forms the basis of a titrimetric analytical method for boric acid. Metaborate esters show considerable Lewis acidity and can initiate epoxide polymerization reactions. [4]
When given the chemical formula of a borane (B m H n), one can deduce its styx numbers by first separating the formula into (BH) m H n-m. Then, one can make use of three equations: [ 2 ] [ 4 ] s+x=n-m, due to the number of hydrogen atoms
When only one functional group is present borylation occurs in the meta and para position in statistical ratios of 2:1 (meta:para). The ortho isomer is not detected due to the steric effects of the substituent. [16] Meta-para borylation. Addition of Bpin occurs in only one position for symmetrically substituted 1,2- and 1,4-substituted arenes.
The usual amount of the thickener is 6%. The amount of thickener can be decreased to 1% if other diluents are added. For example, n-hexane, can be used with increased safety by rendering the compound non-pyrophoric until the diluent evaporates, at which point a combined fireball results from both the triethylaluminium and the hexane vapors. [16]