Selective Oxidation Reactions of Natural Compounds with
... Methyltrioxorhenium (CH3ReO3, MTO) in the presence of H2O2 has proven itself as an efficient and versatile oxidation catalyst with interesting selectivity towards natural compounds, which can be oxidized under quite mild conditions [3–21]. In previous work [22] we have observed good regio- and stere ...
... Methyltrioxorhenium (CH3ReO3, MTO) in the presence of H2O2 has proven itself as an efficient and versatile oxidation catalyst with interesting selectivity towards natural compounds, which can be oxidized under quite mild conditions [3–21]. In previous work [22] we have observed good regio- and stere ...
Large coordination complexes: synthesis, characterisation and
... presence of two methyl groups remote from the coordination centre. Their coordination properties would be expected to be identical, the only difference being their molecular weight, 28 units greater for 2 than for 1. We will call these two ligands pseudoisotopic molecules, defined as two species whi ...
... presence of two methyl groups remote from the coordination centre. Their coordination properties would be expected to be identical, the only difference being their molecular weight, 28 units greater for 2 than for 1. We will call these two ligands pseudoisotopic molecules, defined as two species whi ...
Chapter 24 Transition Metals and Coordination Compounds part 2
... electrons in the d orbitals, this will cause ________________ This will cause those orbitals to be ________________ This will result in them having ______________ A. For an octahedral complex, there are 6 ligand attachment points (along the x, y, & z axes) Three of the orbitals are farther away fr ...
... electrons in the d orbitals, this will cause ________________ This will cause those orbitals to be ________________ This will result in them having ______________ A. For an octahedral complex, there are 6 ligand attachment points (along the x, y, & z axes) Three of the orbitals are farther away fr ...
Document
... H bonding in polar compd. Stronger than alcohol because OH is more polarized (presence of e– carbonyl groups) ...
... H bonding in polar compd. Stronger than alcohol because OH is more polarized (presence of e– carbonyl groups) ...
PREPARATORY PROBLEMS (Theoretical)
... Problem 1. ON THE BORDERS OF THE PERIODIC SYSTEM ............................................................................................ 3 Problem 2. SCHRÖDINGER CAT AND CHEMISTRY............................................................................................................ 4 Probl ...
... Problem 1. ON THE BORDERS OF THE PERIODIC SYSTEM ............................................................................................ 3 Problem 2. SCHRÖDINGER CAT AND CHEMISTRY............................................................................................................ 4 Probl ...
molecules Palladium and Organocatalysis: An Excellent Recipe for Asymmetric Synthesis
... activation, enamine activation, and palladium-catalyzed enyne cycloisomerization [46]. Córdova’s methodology allows the preparation of functionalized optically active cyclopentenes with all-carbon quaternary stereocenters in good diastereo- and high enantioselectivities from simple starting material ...
... activation, enamine activation, and palladium-catalyzed enyne cycloisomerization [46]. Córdova’s methodology allows the preparation of functionalized optically active cyclopentenes with all-carbon quaternary stereocenters in good diastereo- and high enantioselectivities from simple starting material ...
PREPARATORY PROBLEMS
... Problem 1. ON THE BORDERS OF THE PERIODIC SYSTEM ............................................................................................ 3 Problem 2. SCHRÖDINGER CAT AND CHEMISTRY............................................................................................................ 4 Probl ...
... Problem 1. ON THE BORDERS OF THE PERIODIC SYSTEM ............................................................................................ 3 Problem 2. SCHRÖDINGER CAT AND CHEMISTRY............................................................................................................ 4 Probl ...
d-Block metal chemistry: general considerations
... Specifying the counter-ion is important since the energy difference between 8-coordinate structures tends to be small with the result that the preference between two structures may be altered by crystal packing forces in two different salts. which possess square antiprismatic or dodecahedral struc ...
... Specifying the counter-ion is important since the energy difference between 8-coordinate structures tends to be small with the result that the preference between two structures may be altered by crystal packing forces in two different salts. which possess square antiprismatic or dodecahedral struc ...
Synthetic Polymers
... functional groups, an amine group & a carboxylic group. When two amino acids react together an amide linkage (peptide linkage) is formed to form a dipeptide (2 amino acids together) there are 20 different amino acids. Different amino acids react to form different proteins. ...
... functional groups, an amine group & a carboxylic group. When two amino acids react together an amide linkage (peptide linkage) is formed to form a dipeptide (2 amino acids together) there are 20 different amino acids. Different amino acids react to form different proteins. ...
Lecture note Part II (Coordination Chemistry)
... for the central atom the following rules are used: in a neutral or cationic complex the name of the metal is used followed by an information on its oxidation state in an anionic complex the name of the metal is used plus an suffix -ate for some metals the latin name has to be used: -plumbate, -ferra ...
... for the central atom the following rules are used: in a neutral or cationic complex the name of the metal is used followed by an information on its oxidation state in an anionic complex the name of the metal is used plus an suffix -ate for some metals the latin name has to be used: -plumbate, -ferra ...
Disproportionation of Monolithium Acetylide into
... This Note establishes for the first time that disproportionation of lithium acetylide into dilithium carbide and acetylene is a reversible process in THF at 0 °C and that such an equilibrium may be readily displaced by addition of an electrophile (Scheme 2). Addition of a 1.6 M solution of n-butylli ...
... This Note establishes for the first time that disproportionation of lithium acetylide into dilithium carbide and acetylene is a reversible process in THF at 0 °C and that such an equilibrium may be readily displaced by addition of an electrophile (Scheme 2). Addition of a 1.6 M solution of n-butylli ...
CHAPTER 21 PHENOLS AND ARYL HALIDES
... (1) Having higher boiling points: phenols are able to form strong intermolecular hydrogen bonds . For example: phenol (bp,182℃) has a boiling point more than 70℃ higher than toluene(bp,110.6℃),even though the two molecular have almost the same molecular weight. (2) Modest solubility in water: the ab ...
... (1) Having higher boiling points: phenols are able to form strong intermolecular hydrogen bonds . For example: phenol (bp,182℃) has a boiling point more than 70℃ higher than toluene(bp,110.6℃),even though the two molecular have almost the same molecular weight. (2) Modest solubility in water: the ab ...
413-420_00_j_o_kones..
... simpler and smaller glucose. In this process, starch feedstocks are grounded and mixed with water to produce a mash typically contained 15–20% starch. The mash is then cooked at or above its boiling point and treated subsequently with two-enzyme preparation. The first enzyme hydrolyses starch molecu ...
... simpler and smaller glucose. In this process, starch feedstocks are grounded and mixed with water to produce a mash typically contained 15–20% starch. The mash is then cooked at or above its boiling point and treated subsequently with two-enzyme preparation. The first enzyme hydrolyses starch molecu ...
Reaction with hydrogen halides
... Structural isomers are molecules that have the same molecular formula but different arrangement of the atoms. A free radical contains an unpaired electron and so is very reactive. Alkanes are saturated hydrocarbons and undergo substitution reactions. Alkenes are unsaturated hydrocarbons and undergo ...
... Structural isomers are molecules that have the same molecular formula but different arrangement of the atoms. A free radical contains an unpaired electron and so is very reactive. Alkanes are saturated hydrocarbons and undergo substitution reactions. Alkenes are unsaturated hydrocarbons and undergo ...
98 pts
... • (T) All E1 reactions involve formation of carbocations; • (T) More stable carbocations are generated faster; • (T) Carbocations are electrophiles; • (T) Carbocations are electron deficient; • (T) Free radicals are electron deficient; • (T) Alcohols are Brønsted bases; • (F) The rate-determining st ...
... • (T) All E1 reactions involve formation of carbocations; • (T) More stable carbocations are generated faster; • (T) Carbocations are electrophiles; • (T) Carbocations are electron deficient; • (T) Free radicals are electron deficient; • (T) Alcohols are Brønsted bases; • (F) The rate-determining st ...
Chapter 1: General Introduction
... Lukehart prepared a fascinating monorhenium compound displaying both acyl and hydroxycarbene ligands32 – the synthesis is shown in Scheme 1.9. The intermediate was referred to as a metalloacetylacetonato complex because it is the organometallic analogue of acac and may itself be a ligand to other me ...
... Lukehart prepared a fascinating monorhenium compound displaying both acyl and hydroxycarbene ligands32 – the synthesis is shown in Scheme 1.9. The intermediate was referred to as a metalloacetylacetonato complex because it is the organometallic analogue of acac and may itself be a ligand to other me ...
synthesis and characterization of tetracarbonyl[6
... Organometallic compounds are those which contain a metal-carbon bond. The variety of the organic moiety in such compounds is practically infinite, ranging from alkyl substituents to alkenes, alkynes, carbonyls, aromatic and heterocyclic compounds. Although some organometallic compounds have been kno ...
... Organometallic compounds are those which contain a metal-carbon bond. The variety of the organic moiety in such compounds is practically infinite, ranging from alkyl substituents to alkenes, alkynes, carbonyls, aromatic and heterocyclic compounds. Although some organometallic compounds have been kno ...
chapter 6-hydroxyl compounds
... - Reason: a more highly substituted alkyl group inhibits solvation of the alkoxide ion and drives the dissociation equilibrium to the left. - For example: methanol is more acidic than t-butyl alcohol. • The present of electron-withdrawing atoms enhances the acidity of alcohols. - Reason: the electro ...
... - Reason: a more highly substituted alkyl group inhibits solvation of the alkoxide ion and drives the dissociation equilibrium to the left. - For example: methanol is more acidic than t-butyl alcohol. • The present of electron-withdrawing atoms enhances the acidity of alcohols. - Reason: the electro ...
Future perspectives in catalysis - NRSC
... It was also launched a quest to research and understand the underlying process. In 2007, the German scientist Gerhard Ertl was awarded the Nobel Prize for Chemistry for unraveling the mechanisms of the Haber-Bosch process. In the 1960s, he began using the equipment used in the burgeoning semiconduct ...
... It was also launched a quest to research and understand the underlying process. In 2007, the German scientist Gerhard Ertl was awarded the Nobel Prize for Chemistry for unraveling the mechanisms of the Haber-Bosch process. In the 1960s, he began using the equipment used in the burgeoning semiconduct ...
ppt
... Mechanism occurs in two stages. The first is addition of the nucleophile to the carbonyl carbon to form a tetrahedral intermediate. The second stage in collapse of the tetrahedral intermediate to reform a carbonyl with expulsion of a leaving group (Y). There is overall substitution of the leaving gr ...
... Mechanism occurs in two stages. The first is addition of the nucleophile to the carbonyl carbon to form a tetrahedral intermediate. The second stage in collapse of the tetrahedral intermediate to reform a carbonyl with expulsion of a leaving group (Y). There is overall substitution of the leaving gr ...
Power point
... separation was achieved by adjusting pH and organic complexant Separation of Cm from Am was performed with 0.01 % ethylenediamine-tetramethylphosphonic acid at pH 3.4 in 0.1 M NaNO3 with a separation factor of 1.4 Separation of gram scale quantities of Am and Cm has been achieved by cation and a ...
... separation was achieved by adjusting pH and organic complexant Separation of Cm from Am was performed with 0.01 % ethylenediamine-tetramethylphosphonic acid at pH 3.4 in 0.1 M NaNO3 with a separation factor of 1.4 Separation of gram scale quantities of Am and Cm has been achieved by cation and a ...
Rules and Clues for Determining Oxidation Number
... F: Always –1, except F2 O: Almost always –2 (exceptions: cmpds. w/ O-O or O-F bonds) Alkali metals: Always +1 (except pure metal (0)) Alkaline earths: Always +2 (except pure metal (0)) H: +1 when bonded to main group (C, O, N, halide groups) -1 when bonded to metals 5. Ranges of oxidation states for ...
... F: Always –1, except F2 O: Almost always –2 (exceptions: cmpds. w/ O-O or O-F bonds) Alkali metals: Always +1 (except pure metal (0)) Alkaline earths: Always +2 (except pure metal (0)) H: +1 when bonded to main group (C, O, N, halide groups) -1 when bonded to metals 5. Ranges of oxidation states for ...
Hydroformylation
Hydroformylation, also known as oxo synthesis or oxo process, is an important homogeneously catalyzed industrial process for the production of aldehydes from alkenes. This chemical reaction entails the addition of a formyl group (CHO) and a hydrogen atom to a carbon-carbon double bond. This process has undergone continuous growth since its invention in 1938: Production capacity reached 6.6×106 tons in 1995. It is important because the resulting aldehydes are easily converted into many secondary products. For example, the resulting aldehydes are hydrogenated to alcohols that are converted to plasticizers or detergents. Hydroformylation is also used in specialty chemicals, relevant to the organic synthesis of fragrances and natural products. The development of hydroformylation, which originated within the German coal-based industry, is considered one of the premier achievements of 20th-century industrial chemistry.The process typically entails treatment of an alkene with high pressures (between 10 to 100 atmospheres) of carbon monoxide and hydrogen at temperatures between 40 and 200 °C. Transition metal catalysts are required.