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PDF - Nanyang Technological University
... For reactions that were carried out in DMF (Table 1, entry 6), the low ee values were largely caused by the racemic background reaction that is not catalyzed by the amine. To suppress the racemic background reaction, we screened solvents for this cooperative system with catalyst C (Table 1, entries ...
... For reactions that were carried out in DMF (Table 1, entry 6), the low ee values were largely caused by the racemic background reaction that is not catalyzed by the amine. To suppress the racemic background reaction, we screened solvents for this cooperative system with catalyst C (Table 1, entries ...
Synthetic Applications of Zinc Borohydride
... reagents. The intermediate obtained is presumably oxazaborolidine, which is highly useful in the enantioselective reduction of prochiral ketones. ...
... reagents. The intermediate obtained is presumably oxazaborolidine, which is highly useful in the enantioselective reduction of prochiral ketones. ...
View/Open - Minerva Access
... cyclotron resonance spectrometer (Bruker 7T FT-ICR) equipped with an ESI source, and coupled with the tuneable IR free-electron laser (FEL) of CLIO (Centre Laser Infrarouge d’Orsay) producing mid-infrared radiation in the 900–1800 cm−1 range [24]. Desired massselected ions are trapped in a ~5 cm lon ...
... cyclotron resonance spectrometer (Bruker 7T FT-ICR) equipped with an ESI source, and coupled with the tuneable IR free-electron laser (FEL) of CLIO (Centre Laser Infrarouge d’Orsay) producing mid-infrared radiation in the 900–1800 cm−1 range [24]. Desired massselected ions are trapped in a ~5 cm lon ...
Amines(Chapter 13)
... Describe a method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reactions involved. Answer : Primary, secondary and tertiary amines can be identified and distinguished by Hinsberg's test. In this test, the amines are allowed to react with Hins ...
... Describe a method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reactions involved. Answer : Primary, secondary and tertiary amines can be identified and distinguished by Hinsberg's test. In this test, the amines are allowed to react with Hins ...
Ch 7 - Practice problem (Answers)
... 6. How many isomeric alkenes of formula C5H10, including stereoisomers, are possible? A) three B) four C) five D) six Ans: D 7. What is the IUPAC name of the following compound? ...
... 6. How many isomeric alkenes of formula C5H10, including stereoisomers, are possible? A) three B) four C) five D) six Ans: D 7. What is the IUPAC name of the following compound? ...
Redox reactions_organic - Welcome to SALEM
... Alkenes react rapidly and quantitatively with ozone form an unstable compound, known as ozonide ...
... Alkenes react rapidly and quantitatively with ozone form an unstable compound, known as ozonide ...
Zinc Alkyls in Organic Synthesis
... suggested that the nature of substituents on the starting alkene determines the relative position of the third substituent. The workers also noted that the reaction proceeds by electrophilic addition, preferentially giving the thermodynamically less stable yet synthetically more interesting syn-isom ...
... suggested that the nature of substituents on the starting alkene determines the relative position of the third substituent. The workers also noted that the reaction proceeds by electrophilic addition, preferentially giving the thermodynamically less stable yet synthetically more interesting syn-isom ...
Kinetics and Mechanisms of the Reactions of Diaryl
... alcohols in solution and concluded that the reaction most likely proceeds via the reversible formation of a relatively long-lived germylene-alcohol complex,20-22 in agreement with the earlier conclusions of Ando and co-workers.7 No reliable kinetic data yet exist on the reactions of transient germyl ...
... alcohols in solution and concluded that the reaction most likely proceeds via the reversible formation of a relatively long-lived germylene-alcohol complex,20-22 in agreement with the earlier conclusions of Ando and co-workers.7 No reliable kinetic data yet exist on the reactions of transient germyl ...
Studies toward the Stereoselective Synthesis of the
... agents of various diseases in man and his domestic animals. Human beings and animals get the diseases, commonly called mycotoxicoses through the ingestion of foods or feeds contaminated by these toxic fungal metabolites. The outbreak of a mycotoxicosis that caused the death of 100 000 turkeys, 14 00 ...
... agents of various diseases in man and his domestic animals. Human beings and animals get the diseases, commonly called mycotoxicoses through the ingestion of foods or feeds contaminated by these toxic fungal metabolites. The outbreak of a mycotoxicosis that caused the death of 100 000 turkeys, 14 00 ...
Optical basicity - Archives ouvertes HAL Artois
... other molecules (alcohols, etc.). If parameters describing the catalytic activity are numerous and fairly wellknown, selectivity is always related to kinetics, e.g., expressed as a ratio of the rates of one process compared to another one. Finding parameters able to account for selectivity in mild o ...
... other molecules (alcohols, etc.). If parameters describing the catalytic activity are numerous and fairly wellknown, selectivity is always related to kinetics, e.g., expressed as a ratio of the rates of one process compared to another one. Finding parameters able to account for selectivity in mild o ...
IOSR Journal of Applied Chemistry (IOSR-JAC)
... transformations, as well as providing a glimpse of further developments to come, this review offers to present a comprehensive report on recent developments in the iron-catalyzed transformations to the synthesis of heterocyclic compounds up to the end of 2014. Although it is well nigh impossible to ...
... transformations, as well as providing a glimpse of further developments to come, this review offers to present a comprehensive report on recent developments in the iron-catalyzed transformations to the synthesis of heterocyclic compounds up to the end of 2014. Although it is well nigh impossible to ...
An experimentally validated numerical model of interface advance of
... crystallite textures and cracks that scatter light [28]. This makes the reorganization visible under optical microscopy. Therefore, in this study a transparent epoxy was used such that the motion of the reaction front in the bulk can be visualized by an optical microscopy system. To this end, prepar ...
... crystallite textures and cracks that scatter light [28]. This makes the reorganization visible under optical microscopy. Therefore, in this study a transparent epoxy was used such that the motion of the reaction front in the bulk can be visualized by an optical microscopy system. To this end, prepar ...
Carbonyl Compounds I. Aldehydes and Ketones
... methanal hydration, largely because the carbon-carbon double bond is weaker. Even so, methanal adds water rapidly and reversibly at room temperature without need for a catalyst. The corresponding addition of water to ethene occurs only in the presence of strongly acidic catalysts (Section 10-3E, Tab ...
... methanal hydration, largely because the carbon-carbon double bond is weaker. Even so, methanal adds water rapidly and reversibly at room temperature without need for a catalyst. The corresponding addition of water to ethene occurs only in the presence of strongly acidic catalysts (Section 10-3E, Tab ...
Alkyl Halides02
... nature of the solvent. In general, factors that lower G*, either by stabilizing C+ intermediate or by raising the reactant energy, favor faster SN1 reactions. Conversely, factors that raise G*, either by destabilizing the C+ intermediate or by lowering reactant energy level, slow down SN1 reaction ...
... nature of the solvent. In general, factors that lower G*, either by stabilizing C+ intermediate or by raising the reactant energy, favor faster SN1 reactions. Conversely, factors that raise G*, either by destabilizing the C+ intermediate or by lowering reactant energy level, slow down SN1 reaction ...
homogeneous catalysis
... and a much wider application in the future is anticipated. Numerous publications and patent applications testify to the fact that in both the academic and industrial research laboratories the growth in research activity in this area in the past decade or so has been phenomenal. Written mainly from a ...
... and a much wider application in the future is anticipated. Numerous publications and patent applications testify to the fact that in both the academic and industrial research laboratories the growth in research activity in this area in the past decade or so has been phenomenal. Written mainly from a ...
Full Article - PDF - Brandeis University
... The scope of the reaction was found to be extremely general. Clean kinetic resolutions of extraordinarily high enantioselectivities were attainable with a wide range of UNCAs bearing various substituents and protecting groups (Table 3). Using the same extractive procedure for the isolation of 3a and ...
... The scope of the reaction was found to be extremely general. Clean kinetic resolutions of extraordinarily high enantioselectivities were attainable with a wide range of UNCAs bearing various substituents and protecting groups (Table 3). Using the same extractive procedure for the isolation of 3a and ...
On the Networking Mechanisms of Additives
... is a constant.11 – 13 Regression equations 12 correlating directly m with E and m with f have been derived for hardened phenol–formaldehyde (PF), resorcinol–formaldehyde (RF), melamine–formaldehyde (MF), and tannin–formaldehyde (TF) resins. These relationships will then be used to correlate the numb ...
... is a constant.11 – 13 Regression equations 12 correlating directly m with E and m with f have been derived for hardened phenol–formaldehyde (PF), resorcinol–formaldehyde (RF), melamine–formaldehyde (MF), and tannin–formaldehyde (TF) resins. These relationships will then be used to correlate the numb ...
Kinetics and Reaction Pathways for Propane Dehydrogenation and
... propane from propene molecules formed in oligomerizationcracking cycles. Propane molecules do not reach a binomial distribution, even at the highest conversion levels, because propane dehydrogenation steps are far from equilibrium. The selectivity, product site-yield, and isotopic data presented are ...
... propane from propene molecules formed in oligomerizationcracking cycles. Propane molecules do not reach a binomial distribution, even at the highest conversion levels, because propane dehydrogenation steps are far from equilibrium. The selectivity, product site-yield, and isotopic data presented are ...
10.4 Alcohols - SCIS Teachers
... •Alcohols have the general formula: CnH2n+1OH •The physical properties of alcohols are similar to those of both water and hydrocarbons •The shorter chain alcohols such as methanol and ethanol are similar to water, in general they •have higher boiling points than hydrocarbons but lower than water •di ...
... •Alcohols have the general formula: CnH2n+1OH •The physical properties of alcohols are similar to those of both water and hydrocarbons •The shorter chain alcohols such as methanol and ethanol are similar to water, in general they •have higher boiling points than hydrocarbons but lower than water •di ...
nucleophilic addition on ketones and ketimines - ISI
... The asymmetric allylation of ketones was also recently studied by the groups of Shibasaki22 and Yamamoto23 using soft transition metal–chiral diphosphine complexes as catalysts (Scheme 9). Shibasaki et al. used allyl boronates as nucleophiles for the allyl transfer on aliphatic and aromatic ketones ...
... The asymmetric allylation of ketones was also recently studied by the groups of Shibasaki22 and Yamamoto23 using soft transition metal–chiral diphosphine complexes as catalysts (Scheme 9). Shibasaki et al. used allyl boronates as nucleophiles for the allyl transfer on aliphatic and aromatic ketones ...
CHM-373 American Women in Science and Society
... • Ketones and aldehydes are more polar. Have higher boiling point that comparable alkanes or ...
... • Ketones and aldehydes are more polar. Have higher boiling point that comparable alkanes or ...
ALKANE ALKYL HALIDE Halogenation of Alkanes
... reagents: 1) CH2N2 (diazomethane), heat carbene mechanism (write on back of card) 2) CH2I2, Zn/Hg (Simmons-Smith reaction) gives fewer side products 3) CHCl3, (CH3)3COK carbene mechanism (write on back of card) two of the halogens remain attached not subject to rearrangements ...
... reagents: 1) CH2N2 (diazomethane), heat carbene mechanism (write on back of card) 2) CH2I2, Zn/Hg (Simmons-Smith reaction) gives fewer side products 3) CHCl3, (CH3)3COK carbene mechanism (write on back of card) two of the halogens remain attached not subject to rearrangements ...
13-Elimination Reactions
... The transition state of an E2 mechanism involves both the leaving group and the base, so reactions that follow the E2 mechanism are concerted. The base removes the electrophile, often a proton, at the same time that the leaving group departs. Also, while the reaction is in the transition state, the ...
... The transition state of an E2 mechanism involves both the leaving group and the base, so reactions that follow the E2 mechanism are concerted. The base removes the electrophile, often a proton, at the same time that the leaving group departs. Also, while the reaction is in the transition state, the ...
Oxygen Isotope Effects as Structural and Mechanistic Probes in
... processes. Isotopic methods are presently being applied to characterize reactions of natural abundance O2 including its coordination to reduced transition metals and cleavage of the O-O bond. This review describes the application of competitive oxygen-18 isotope effects, together with Density Functi ...
... processes. Isotopic methods are presently being applied to characterize reactions of natural abundance O2 including its coordination to reduced transition metals and cleavage of the O-O bond. This review describes the application of competitive oxygen-18 isotope effects, together with Density Functi ...
Ene reaction
![](https://commons.wikimedia.org/wiki/Special:FilePath/Figure1newene.png?width=300)
The ene reaction (also known as the Alder-ene reaction) is a chemical reaction between an alkene with an allylic hydrogen (the ene) and a compound containing a multiple bond (the enophile), in order to form a new σ-bond with migration of the ene double bond and 1,5 hydrogen shift. The product is a substituted alkene with the double bond shifted to the allylic position.This transformation is a group transfer pericyclic reaction, and therefore, usually requires highly activated substrates and/or high temperatures. Nonetheless, the reaction is compatible with a wide variety of functional groups that can be appended to the ene and enophile moieties. Also,many useful Lewis acid-catalyzed ene reactions have been developed which can afford high yields and selectivities at significantly lower temperatures, making the ene reaction a useful C–C forming tool for the synthesis of complex molecules and natural products.