New insights into the mechanism of sorbitol transformation
... crystalline cellulose requires harsh hydrolysis conditions which lead to glucose degradation. Thus, the chemical trapping of glucose into valuable chemicals before its degradation in reaction media increases the yield of the hydrolysis process [4]. The production of sorbitol from cellulose by hydrol ...
... crystalline cellulose requires harsh hydrolysis conditions which lead to glucose degradation. Thus, the chemical trapping of glucose into valuable chemicals before its degradation in reaction media increases the yield of the hydrolysis process [4]. The production of sorbitol from cellulose by hydrol ...
Carbonyl Compounds I. Aldehydes and Ketones
... at one step or another. For the reactions of organometallic reagents and alcohols with carbonyl compounds (Chapters 14 and 15), you may recall that steric hindrance plays an important role in determining the ratio between addition and other, competing reactions. Similar effects are observed in a wid ...
... at one step or another. For the reactions of organometallic reagents and alcohols with carbonyl compounds (Chapters 14 and 15), you may recall that steric hindrance plays an important role in determining the ratio between addition and other, competing reactions. Similar effects are observed in a wid ...
Biomimetic oxidation of catechol employing complexes formed in
... ZnCl2), which aimed to mimic the active site of catechol oxidase. In order to determine factors influencing the catecholase activity of these complexes, the effect of ligand concentration and the nature of solvent have been studied. The highest rate of catechol oxidation is given by the combination ...
... ZnCl2), which aimed to mimic the active site of catechol oxidase. In order to determine factors influencing the catecholase activity of these complexes, the effect of ligand concentration and the nature of solvent have been studied. The highest rate of catechol oxidation is given by the combination ...
Nickel(II) Catalysts for Ethylene Homo
... mostly value-added linear, #-olefins of C4~20+ range. These oligomers can then be applied as comonomers for LLDPE products, or used in the synthesis of plasticizers and detergents. Further efforts to enhance these catalysts’ performance have afforded not only new types of ...
... mostly value-added linear, #-olefins of C4~20+ range. These oligomers can then be applied as comonomers for LLDPE products, or used in the synthesis of plasticizers and detergents. Further efforts to enhance these catalysts’ performance have afforded not only new types of ...
f8560d95306293b
... is similar to the tetrahedral bond angle of 109.5°. • Because the O atom is much more electronegative than carbon or hydrogen, the C—O and O—H bonds are all polar ...
... is similar to the tetrahedral bond angle of 109.5°. • Because the O atom is much more electronegative than carbon or hydrogen, the C—O and O—H bonds are all polar ...
Lecture - Ch 16
... Benzyne • A Diels-Adler reaction occurs when bromobenzene reacts with KNH2 in the presence of a conjugated diene, such as furan – Elimination of HBr from bromobenzene forms a benzyne as the chemical intermediate ...
... Benzyne • A Diels-Adler reaction occurs when bromobenzene reacts with KNH2 in the presence of a conjugated diene, such as furan – Elimination of HBr from bromobenzene forms a benzyne as the chemical intermediate ...
Matter and Measurement
... Properties of Alkanes Long, unbranched alkanes tend to have higher melting points, boiling points, and enthalpies of vaporization than their branched isomers ...
... Properties of Alkanes Long, unbranched alkanes tend to have higher melting points, boiling points, and enthalpies of vaporization than their branched isomers ...
New System of Deprotection Step for the Hydroxide Radicals: Boron
... Abstract A new efficient method for dealkylation of ethers is reported. Ethers could transform into corresponding alcohols with boron trifluoride etherate and sodium iodide in acetonitrile after hydrolysis. This reaction can proceed at room temperature, and the yield is excellent. It’s useful for de ...
... Abstract A new efficient method for dealkylation of ethers is reported. Ethers could transform into corresponding alcohols with boron trifluoride etherate and sodium iodide in acetonitrile after hydrolysis. This reaction can proceed at room temperature, and the yield is excellent. It’s useful for de ...
WADE7Lecture10a
... • Reduction of aldehyde yields 1º alcohol. • Reduction of ketone yields 2º alcohol. ...
... • Reduction of aldehyde yields 1º alcohol. • Reduction of ketone yields 2º alcohol. ...
4. The dioxygen molecule, O2: Uptake, Transport and Storage of an
... Course of study for a Master of Science (M.S.) degree in Chemistry shall have a duration of one academic year. The examination can be taken either in the General or in the Thesis group. A candidate for M.S. degree in Chemistry will have to take up courses in Physical, Inorganic and Organic branch. S ...
... Course of study for a Master of Science (M.S.) degree in Chemistry shall have a duration of one academic year. The examination can be taken either in the General or in the Thesis group. A candidate for M.S. degree in Chemistry will have to take up courses in Physical, Inorganic and Organic branch. 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.