Student number: 單選題（共 55 題，每題 2 分，合
... Electrons flow from the Pt electrode to the Cr electrode. Reduction occurs at the Pt electrode. The cell is not at standard conditions. To complete the circuit, cations migrate into the left half-cell and anions migrate into the right half-cell from the salt bridge. ...
... Electrons flow from the Pt electrode to the Cr electrode. Reduction occurs at the Pt electrode. The cell is not at standard conditions. To complete the circuit, cations migrate into the left half-cell and anions migrate into the right half-cell from the salt bridge. ...
Secondary alcohols
... At higher temperatures, or in the absence of good nucleophiles, elimination becomes dominant. ...
... At higher temperatures, or in the absence of good nucleophiles, elimination becomes dominant. ...
Carbonyl Compounds_ Properties and Reactions
... Aldehydes and ketones containing the CH3C=O group will give a positive result with the triiodomethane reaction. Therefore, only aldehyde to give a positive result is ETHANAL Alcohols will also give a positive result if they can first oxidise to a ketone (secondary alcohols) containing the above grou ...
... Aldehydes and ketones containing the CH3C=O group will give a positive result with the triiodomethane reaction. Therefore, only aldehyde to give a positive result is ETHANAL Alcohols will also give a positive result if they can first oxidise to a ketone (secondary alcohols) containing the above grou ...
H + - uaschemistry
... • A group that donates electrons, such as CH3, will make the anion less stable (stronger conjugate base) and the acid weaker. • Q: What would the order of pKa, from largest to smallest, be for ethanol, phenol, 2-methylphenol, and 2,4,6-trinitrophenol? ...
... • A group that donates electrons, such as CH3, will make the anion less stable (stronger conjugate base) and the acid weaker. • Q: What would the order of pKa, from largest to smallest, be for ethanol, phenol, 2-methylphenol, and 2,4,6-trinitrophenol? ...
Lectures 15, 16 and 17
... carbonyl determines the type of reactions the carbonyl compound will undergo. • Carbonyl carbons are sp2 hybridized, trigonal planar, and have bond angles that are ~1200. In these ways, the carbonyl group resembles the trigonal planar sp2 hybridized carbons of a C=C. ...
... carbonyl determines the type of reactions the carbonyl compound will undergo. • Carbonyl carbons are sp2 hybridized, trigonal planar, and have bond angles that are ~1200. In these ways, the carbonyl group resembles the trigonal planar sp2 hybridized carbons of a C=C. ...
Organic Synthesis - National Open University of Nigeria
... nowadays most reactions are effected with m-chloroperbenzoic acid. This is more stable than the other acids, which usually have to be prepared immediately before use, and is commercially available. The reaction occurs under mild conditions and has been widely used both in degradative work and in syn ...
... nowadays most reactions are effected with m-chloroperbenzoic acid. This is more stable than the other acids, which usually have to be prepared immediately before use, and is commercially available. The reaction occurs under mild conditions and has been widely used both in degradative work and in syn ...
Lecture 1: Key Concepts in Stereoselective Synthesis
... photocatalytic cycle, with no change to the overall oxidation state from starting materials to product. The ability to have both oxidation and reduction processes occurring simultaneously for one overall reaction can enable reaction pathways that would otherwise not be possible. 1.3.1 [2+2] Cycloadd ...
... photocatalytic cycle, with no change to the overall oxidation state from starting materials to product. The ability to have both oxidation and reduction processes occurring simultaneously for one overall reaction can enable reaction pathways that would otherwise not be possible. 1.3.1 [2+2] Cycloadd ...
Rapid and Efficient Functionalized Ionic Liquid-Catalyzed
... Aldol reactions are an effective means of forming C–C bonds and the products of α,β-unsaturated ketones are frequently found in complex polyol architectures of natural products. These reactions are highly atom-economic and have been studied extensively [10–14]. Generally, the synthetic approach to a ...
... Aldol reactions are an effective means of forming C–C bonds and the products of α,β-unsaturated ketones are frequently found in complex polyol architectures of natural products. These reactions are highly atom-economic and have been studied extensively [10–14]. Generally, the synthetic approach to a ...
An Anionic Dimer of Cyclopentadienyl
... and catalysis, to novel chemistry of molecular systems [1]. Particularly, complexes having two widely divergent metals, one a Lewis-acid early transition metal and the other an electronrich late transition metal are promising candidates for new stoichiometric and catalytic reactions [2,3] and they s ...
... and catalysis, to novel chemistry of molecular systems [1]. Particularly, complexes having two widely divergent metals, one a Lewis-acid early transition metal and the other an electronrich late transition metal are promising candidates for new stoichiometric and catalytic reactions [2,3] and they s ...
Ring-closing metathesis
Ring-closing metathesis, or RCM, is a widely used variation of olefin metathesis in organic chemistry for the synthesis of various unsaturated rings via the intramolecular metathesis of two terminal alkenes, which forms the cycloalkene as the E- or Z- isomers and volatile ethylene.The most commonly synthesized ring sizes are between 5-7 atoms; however, reported syntheses include 45- up to 90- membered macroheterocycles. These reactions are metal-catalyzed and proceed through a metallacyclobutane intermediate. It was first published by Dider Villemin in 1980 describing the synthesis of an Exaltolide precursor, and later become popularized by Robert H. Grubbs and Richard R. Schrock, who shared the Nobel Prize in Chemistry, along with Yves Chauvin, in 2005 for their combined work in olefin metathesis. RCM is a favorite among organic chemists due to its synthetic utility in the formation of rings, which were previously difficult to access efficiently, and broad substrate scope. Since the only major by-product is ethylene, these reactions may also be considered atom economic, an increasingly important concern in the development of green chemistry.There are several reviews published on ring-closing metathesis.