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This reagent is generated by treating 9-BBN with α-pinene. [2] This sterically crowded chiral trialkylborane can stereoselectively reduce aldehydes in what is known as the Midland Alpine borane reduction, or simply the Midland reduction. [3] C 8 H 12 B-pinanyl + RCDO → C 8 H 12 BOCHDR + (+)-d-pinene. Hydrolysis of the resulting borinic ester ...
9-Borabicyclo[3.3.1]nonane or 9-BBN is an organoborane compound. This colourless solid is used in organic chemistry as a hydroboration reagent. The compound exists as a hydride-bridged dimer, which easily cleaves in the presence of reducible substrates. [1] 9-BBN is also known by its nickname 'banana borane'. [2]
In the same year, M. M. Midland discovered B-3-alpha-pinanyl-9-BBN as the reducing agent, which could be easily available by reacting (+)-alpha-pinene with 9-BBN. The new reducing agent was later commercialized by Aldrich Co. under the name Alpine Borane and the asymmetric reduction of carbonyl groups with either enantiomer of Alpine-Borane is ...
9-硼二环[3.3.1]壬烷 Metadata This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
The B3 DNA binding domain (DBD) is a highly conserved domain found exclusively in transcription factors (≥40 species) (Pfam PF02362) combined with other domains (InterPro: IPR003340). It consists of 100-120 residues, includes seven beta strands and two alpha helices that form a DNA-binding pseudobarrel protein fold ( SCOP 117343 ); it ...
C 6 H 4 O 2 BH + HC 2 R → C 6 H 4 O 2 B-CHCHR. The product is a precursor to the Suzuki reaction and is the only borane which stops at the alkene instead of reacting further to the alkane. [3] [4] Catecholborane may be used as a stereoselective reducing agent when converting β-hydroxy ketones to syn 1,3-diols.
BBN might refer to: Bayesian belief network , a probabilistic graphical model that represents a set of random variables and their conditional independencies via a directed acyclic graph Bible Broadcasting Network , a global Christian radio network headquartered in Charlotte, North Carolina
Beryllium-8 (8 Be, Be-8) is a radionuclide with 4 neutrons and 4 protons.It is an unbound resonance and nominally an isotope of beryllium.It decays into two alpha particles with a half-life on the order of 8.19 × 10 −17 seconds.