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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.
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.
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.
Vitamin B 3, colloquially referred to as niacin, is a vitamin family that includes three forms, or vitamers: nicotinic acid (niacin), nicotinamide (niacinamide), and nicotinamide riboside. [1] [2] All three forms of vitamin B 3 are converted within the body to nicotinamide adenine dinucleotide (NAD).
Alpina B3 3.2 Biturbo (E36) Between 1993 and 1996, the BMW Alpina B3 3.0 [4] of the E36 series was produced. It was the direct successor model of the Alpina B6-2.8 model of the E36 series, which was also based on the BMW 325i (but M50B25 without Vanos model until the BMW factory holidays in August 1992 - then with VANOS).
[8] [9] Before the conclusion of the first season Fox ordered a second season. [10] The season aired from September 28 through May 17, 2015. [ 11 ] [ 12 ] During the course of the second season it was renewed for a third season , [ 13 ] which began airing on September 27 and ended on April 19, 2016.