Chemistry 201 - Department of Chemistry | Oregon State University
... In DNA, the base pairs are G and C; A and T. It can be said that this selective pairing is due to: (A) (B) (C) (D) (E) ...
... In DNA, the base pairs are G and C; A and T. It can be said that this selective pairing is due to: (A) (B) (C) (D) (E) ...
PTT102 Aldehydes and Ketones
... carbonyl compound is the nucleophile and second molecule is electrophile. The new C-C bond connect the α-carbon of one molecule and the carbon that was formerly the carbonyl carbon of the other molecule ...
... carbonyl compound is the nucleophile and second molecule is electrophile. The new C-C bond connect the α-carbon of one molecule and the carbon that was formerly the carbonyl carbon of the other molecule ...
PTT102 Aldehydes and Ketones
... carbonyl compound is the nucleophile and second molecule is electrophile. The new C-C bond connect the α-carbon of one molecule and the carbon that was formerly the carbonyl carbon of the other molecule ...
... carbonyl compound is the nucleophile and second molecule is electrophile. The new C-C bond connect the α-carbon of one molecule and the carbon that was formerly the carbonyl carbon of the other molecule ...
Aldehydes and Ketones - University of Nebraska Omaha
... carried out in aqueous methanol, in pure methanol, or in ethanol. • One mole of NaBH4 reduces four moles of aldehyde or ketone. ...
... carried out in aqueous methanol, in pure methanol, or in ethanol. • One mole of NaBH4 reduces four moles of aldehyde or ketone. ...
types of organic reactions
... One product will be there in greater amounts than the other and is called the major product (the other is called the minor product). To decide which is the major product, Markovnikov’s rule is used: The hydrogen atom of the addition reagent goes to the carbon atom of the double bond, that is attache ...
... One product will be there in greater amounts than the other and is called the major product (the other is called the minor product). To decide which is the major product, Markovnikov’s rule is used: The hydrogen atom of the addition reagent goes to the carbon atom of the double bond, that is attache ...
Exam 3 Answer Key
... 6. (2.5) True or False? A molecule with a non-superimposable mirror image must be chiral. 7. (2.5) True or False? A hydrogen attached to a carbon of a triple bond can be abstracted using a base, the conjugate acid of which is stronger than the alkyne. ...
... 6. (2.5) True or False? A molecule with a non-superimposable mirror image must be chiral. 7. (2.5) True or False? A hydrogen attached to a carbon of a triple bond can be abstracted using a base, the conjugate acid of which is stronger than the alkyne. ...
Carbonyl Compounds
... because it has the potential t form multiple H-bonds between molecules, all the bonds must be broken before the compound can pass to vapour phase. ethanoic acid, however, has fewer H-bonds compared with ethanamide. Propanone has no possibility forming H-bonds and the molecules cling together merely ...
... because it has the potential t form multiple H-bonds between molecules, all the bonds must be broken before the compound can pass to vapour phase. ethanoic acid, however, has fewer H-bonds compared with ethanamide. Propanone has no possibility forming H-bonds and the molecules cling together merely ...
Aldehydes and ketones
... Benedict solution is another reagent that can be used to test for aldehydes. (a) ...
... Benedict solution is another reagent that can be used to test for aldehydes. (a) ...
CARBONYL COMPOUNDS
... and HCHO (MR = 30) and put these compounds in order with respect to increasing boiling point. C2H6 CH3OH HCHO Methanal is a gas, other important carbonyl compounds are …………………... Early members are soluble in water due to ……………….. ………………. between hydrogen from water and oxygen from the carboxylic gro ...
... and HCHO (MR = 30) and put these compounds in order with respect to increasing boiling point. C2H6 CH3OH HCHO Methanal is a gas, other important carbonyl compounds are …………………... Early members are soluble in water due to ……………….. ………………. between hydrogen from water and oxygen from the carboxylic gro ...
Organometallic Compounds
... The next slides recall the diversity of nucleophiles that may be used. Observe that there is limited opportunity of creating new C-C bonds, welding together two R groups. We seem to be somewhat lacking in simple carbon based nucleophiles. ...
... The next slides recall the diversity of nucleophiles that may be used. Observe that there is limited opportunity of creating new C-C bonds, welding together two R groups. We seem to be somewhat lacking in simple carbon based nucleophiles. ...
Organometallic Reagents: Sources of Nucleophilic Carbon for
... The alkyl group in alkylmetals is strongly basic. Carbocations are the conjugate bases of alkanes (estimated pKa’s of about 50), and as a result are extremely basic, much more so than amines or alkoxides. Because of their basicity, carbocations are extremely sensitive to moisture or other acidic fu ...
... The alkyl group in alkylmetals is strongly basic. Carbocations are the conjugate bases of alkanes (estimated pKa’s of about 50), and as a result are extremely basic, much more so than amines or alkoxides. Because of their basicity, carbocations are extremely sensitive to moisture or other acidic fu ...
Aldehydes and Ketones
... Acetals are used to “protect” the carbonyl groups of aldehydes and ketones when one wants to have some other part of the molecule react without affecting the aldehyde or ketone functional group. They can be used this way because they are fairly unreactive and the carbonyl functional group can be reg ...
... Acetals are used to “protect” the carbonyl groups of aldehydes and ketones when one wants to have some other part of the molecule react without affecting the aldehyde or ketone functional group. They can be used this way because they are fairly unreactive and the carbonyl functional group can be reg ...
AS Chemistry - Module 1 Definitions
... reaction between two different types of molecule to give a polymer accompanied by the loss of a small molecule such as water ...
... reaction between two different types of molecule to give a polymer accompanied by the loss of a small molecule such as water ...
CH402 Asymmetric catalytic reactions Prof M. Wills
... What properties are required of an asymmetric catalyst? Turnover, rate enhancement, selectivity The catalyst must recognise the reagents, accelerate the reaction, direct the reaction to one face of a substrate and release the product: Catalyst recycled ...
... What properties are required of an asymmetric catalyst? Turnover, rate enhancement, selectivity The catalyst must recognise the reagents, accelerate the reaction, direct the reaction to one face of a substrate and release the product: Catalyst recycled ...
Exam 1
... Acid catalyzed ester & amide hydrolysis, Fisher esterification, trans esterification Hydroxide promoted ester hydrolysis Nucleophilic addition to aldehyde/ketone with Grignard reagents Determine reaction mechanisms from reaction outcome (see Mechanism work sheet). Be able to recognize the following ...
... Acid catalyzed ester & amide hydrolysis, Fisher esterification, trans esterification Hydroxide promoted ester hydrolysis Nucleophilic addition to aldehyde/ketone with Grignard reagents Determine reaction mechanisms from reaction outcome (see Mechanism work sheet). Be able to recognize the following ...
Chem 263 Notes March 2, 2006 Preparation of Aldehydes and
... In general, an aldehyde is more reactive than a ketone. This difference in reactivity can be explained by considering both steric and electronic factors: 1. Sterics: a hydrogen is a lot smaller than an alkyl group. It is easier for a nucleophile to attack. Also, the tetrahedral intermediate is less ...
... In general, an aldehyde is more reactive than a ketone. This difference in reactivity can be explained by considering both steric and electronic factors: 1. Sterics: a hydrogen is a lot smaller than an alkyl group. It is easier for a nucleophile to attack. Also, the tetrahedral intermediate is less ...
Study Guide for Exam 2-‐ Aldehydes and Ketones
... forming an oxaphosphetane intermediate. Thus, the electrophile is not H+ as in the previous examples but the phosphonium center. The intermediate undergoes a reverse 2+2 process to ...
... forming an oxaphosphetane intermediate. Thus, the electrophile is not H+ as in the previous examples but the phosphonium center. The intermediate undergoes a reverse 2+2 process to ...
Asymmetric induction
Asymmetric induction (also enantioinduction) in stereochemistry describes the preferential formation in a chemical reaction of one enantiomer or diastereoisomer over the other as a result of the influence of a chiral feature present in the substrate, reagent, catalyst or environment. Asymmetric induction is a key element in asymmetric synthesis.Asymmetric induction was introduced by Hermann Emil Fischer based on his work on carbohydrates. Several types of induction exist.Internal asymmetric induction makes use of a chiral center bound to the reactive center through a covalent bond and remains so during the reaction. The starting material is often derived from chiral pool synthesis. In relayed asymmetric induction the chiral information is introduced in a separate step and removed again in a separate chemical reaction. Special synthons are called chiral auxiliaries. In external asymmetric induction chiral information is introduced in the transition state through a catalyst of chiral ligand. This method of asymmetric synthesis is economically most desirable.