Homework Answers
2) Intermediate B is the product because it is more stabilized through resonance as shown in resonance structures.
3) C and D are Enantiomers. Both are produce in equal amount because intermediate B is planar on which Nucleophile can attack from both sides of plane and thus both C and D are formed.
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alkene reactivity and its effects on stereo Reactivity In this module, we...
Help on all parts of question 3 would be greatly appreciated! 3. Treating alkene "A" below...
Help on all parts of question 3 would be greatly
appreciated!
3. Treating alkene "A" below with HBr can lead to a number of products. "A" + H-Br A bunch of products. For real, hella products. 3.A. Label the stereocenters in compound "A" as R or S and label the alkene as E or Z. 3.B. Draw the curved arrow mechanism leading to the most stabilized carbo- cation intermediate. (don't do any rearrangements, just acid/base with the alkene) H-Br most...
Tulung ate n illud aludke place in a single step. In the Sn2 reaction, the nucleophile...
Tulung ate n illud aludke place in a single step. In the Sn2 reaction, the nucleophile attacks the a-carbon from the backside and displaces the leaving group with an inversion of configuration occurring at the carbon. In the E2 elimination reaction, strong base removes an acidic hydrogen from the B-carbon and an alkene is formed as the leaving group is expelled from the a-carbon. This elimination follows Zaitsey's rule whereby the more substituted alkene is generally formed. In E2 elimination,...
CHz + PhP-CHCH3 - CH3 НАС НАС Aldehydes and ketones are converted into alkenes by means...
CHz + PhP-CHCH3 - CH3 НАС НАС Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction phosphorane, adds to an aldehyde/ketone to give a four-membered cyclic intermediate called an oxaphosphetane. The decomposes to release triphenylphosphine oxide and an alkene. The ylide is formed by reaction of triphenylphosphine, a good nucleophile, with a primary alkyl halide in an Sy2 react base, such as butyllithium. The carbonyl carbon and the carbon originally bonded...
please Answer in Details showing all the steps. Thank you Look at the following reaction: Toluene...
please Answer in Details showing all the steps.
Thank you
Look at the following reaction: Toluene OH + CH3OH OCH3 + H2O a) What is the effect of each of the given changes (see next page) on the rate of the reaction? The possible answers are: Increases, decreases, remains the same or no more reaction. 1- Decreasing the concentration of CH,OH 2-Using a Dean-Stark apparatus (used to remove water from the reaction mixture) 3- Adding H,SO, to the reaction mixture...
2 problems REVIEW Topics [References) CH HC OCH Br2 CH3 B H3C CH,OH H₂C CH₂ Electrophilic...
2 problems
REVIEW Topics [References) CH HC OCH Br2 CH3 B H3C CH,OH H₂C CH₂ Electrophilic addition of hypohalous acids to alkenes yields a 1,2-haloalcohol called a halohydrin. Halohydrin formation, however, does not result from the addition of HOBr, for example. Instead the addition is done indirectly by reaction of the alkene with Br, in the presence of water. The reaction also works with Cl2 to give chlorohydrins instead of bromohydrins. The reaction proceeds through a cyclic intermediate known as...
please answer all parts, thanks! 1. More substituted alkenes are more stable than less substituted alkenes....
please answer all parts, thanks!
1. More substituted alkenes are more stable than less substituted alkenes. Show the orbital overlap that helps to explain this observation. 2. Why is the heat of hydrogenation for an alkene exothermic? Analyze the bonds that are changing. AH = -30 kcal/mol Explain: + H2 3. Treating alkene "A" below with HBr can lead to a number of products. "A" SM + H-Br A bunch of products. For real, hella products. 3.A. Label the stereocenters...
just need (e) to (h) 5. Molecules with an-OH group directly bonded to a C-C sp...
just need (e) to (h)
5. Molecules with an-OH group directly bonded to a C-C sp hybridized carbon are called "enol"'s. The types of chemical reactions which enols undergo are substantially different from those of normal alcohols. By considering the Brensted-Lowry and Lewis acid/base reactivity of an enol, you can predict a few of these differences. (a) Ethenol, the simplest "enol", can react as a BL. base in three different places, by gaining a proton at either of the two...
Chapter 6 [References) Question 5 o 1 pt CH3 CH3 OCH CH3 ÇI CH3 CI Cl2...
Chapter 6 [References) Question 5 o 1 pt CH3 CH3 OCH CH3 ÇI CH3 CI Cl2 CH3CHCH=CHCH2CH3 Question 6 1 pt CH3CHCHCHCH2CH3 SHCHICH.CH CH3CHCHCHCH2CH3 4,снено CHCHCH2CH3 CH3OH Question 7 1 pt CI OCH3 CI Question 8 ® 1 pt When 2-methyl-3-hexene is treated with Cl, in methanol, three products are formed (neglecting stereoisomers). Draw curved arrows to show the movement of electrons in this step of the reaction mechanism. Question 9 1 pt Question 10 1 pt Arrow-pushing Instructions Question...
СО cat. H + NH2CH3 + H2CO2C CO2CH3 CO CHE Cocaine has been prepared by a...
СО cat. H + NH2CH3 + H2CO2C CO2CH3 CO CHE Cocaine has been prepared by a sequence beginning with a Mannich reaction between dimethyl acetonedicarboxylate, methylamine, and butanedial. The mechanism involves the following steps: 1. Following initial protonation of the carbonyl oxygen, nucleophilic attack by the amine forms carbinolamine 1; 2. Proton transfer and elimination of water forms iminium ion 2; he enol form of the dicarboxylate ester attacks the iminium ion to form adduct 3; 4. Adduct 3 tautomerizes...
250 ChemActivity 29 Electrophilic Aromatic Substitution no ChemActivity 29 Part A: Electrophilic Aromatic Substitution (What products...
250 ChemActivity 29 Electrophilic Aromatic Substitution no ChemActivity 29 Part A: Electrophilic Aromatic Substitution (What products are formed when a strong electrophile is added to benzene?) Model 1: (review) Electrophilic Addition of HCI Rani o g cyclohexene carbocation intermediate Run 2 U X benzene This product carbocation intermediate DOES NOT Critical Thinking Questions 1 For Rxn I (above) draw curved arrows showing the mechanism of electrophilic addition of HCl. Include an appropriate carbocation intermediate in the box above. Figure 1:...
Help on all parts of question 3 would be greatly
appreciated!
3. Treating alkene "A" below with HBr can lead to a number of products. "A" + H-Br A bunch of products. For real, hella products. 3.A. Label the stereocenters in compound "A" as R or S and label the alkene as E or Z. 3.B. Draw the curved arrow mechanism leading to the most stabilized carbo- cation intermediate. (don't do any rearrangements, just acid/base with the alkene) H-Br most...
Tulung ate n illud aludke place in a single step. In the Sn2 reaction, the nucleophile attacks the a-carbon from the backside and displaces the leaving group with an inversion of configuration occurring at the carbon. In the E2 elimination reaction, strong base removes an acidic hydrogen from the B-carbon and an alkene is formed as the leaving group is expelled from the a-carbon. This elimination follows Zaitsey's rule whereby the more substituted alkene is generally formed. In E2 elimination,...
CHz + PhP-CHCH3 - CH3 НАС НАС Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction phosphorane, adds to an aldehyde/ketone to give a four-membered cyclic intermediate called an oxaphosphetane. The decomposes to release triphenylphosphine oxide and an alkene. The ylide is formed by reaction of triphenylphosphine, a good nucleophile, with a primary alkyl halide in an Sy2 react base, such as butyllithium. The carbonyl carbon and the carbon originally bonded...
please Answer in Details showing all the steps.
Thank you
Look at the following reaction: Toluene OH + CH3OH OCH3 + H2O a) What is the effect of each of the given changes (see next page) on the rate of the reaction? The possible answers are: Increases, decreases, remains the same or no more reaction. 1- Decreasing the concentration of CH,OH 2-Using a Dean-Stark apparatus (used to remove water from the reaction mixture) 3- Adding H,SO, to the reaction mixture...
2 problems
REVIEW Topics [References) CH HC OCH Br2 CH3 B H3C CH,OH H₂C CH₂ Electrophilic addition of hypohalous acids to alkenes yields a 1,2-haloalcohol called a halohydrin. Halohydrin formation, however, does not result from the addition of HOBr, for example. Instead the addition is done indirectly by reaction of the alkene with Br, in the presence of water. The reaction also works with Cl2 to give chlorohydrins instead of bromohydrins. The reaction proceeds through a cyclic intermediate known as...
please answer all parts, thanks!
1. More substituted alkenes are more stable than less substituted alkenes. Show the orbital overlap that helps to explain this observation. 2. Why is the heat of hydrogenation for an alkene exothermic? Analyze the bonds that are changing. AH = -30 kcal/mol Explain: + H2 3. Treating alkene "A" below with HBr can lead to a number of products. "A" SM + H-Br A bunch of products. For real, hella products. 3.A. Label the stereocenters...
just need (e) to (h)
5. Molecules with an-OH group directly bonded to a C-C sp hybridized carbon are called "enol"'s. The types of chemical reactions which enols undergo are substantially different from those of normal alcohols. By considering the Brensted-Lowry and Lewis acid/base reactivity of an enol, you can predict a few of these differences. (a) Ethenol, the simplest "enol", can react as a BL. base in three different places, by gaining a proton at either of the two...
Chapter 6 [References) Question 5 o 1 pt CH3 CH3 OCH CH3 ÇI CH3 CI Cl2 CH3CHCH=CHCH2CH3 Question 6 1 pt CH3CHCHCHCH2CH3 SHCHICH.CH CH3CHCHCHCH2CH3 4,снено CHCHCH2CH3 CH3OH Question 7 1 pt CI OCH3 CI Question 8 ® 1 pt When 2-methyl-3-hexene is treated with Cl, in methanol, three products are formed (neglecting stereoisomers). Draw curved arrows to show the movement of electrons in this step of the reaction mechanism. Question 9 1 pt Question 10 1 pt Arrow-pushing Instructions Question...
СО cat. H + NH2CH3 + H2CO2C CO2CH3 CO CHE Cocaine has been prepared by a sequence beginning with a Mannich reaction between dimethyl acetonedicarboxylate, methylamine, and butanedial. The mechanism involves the following steps: 1. Following initial protonation of the carbonyl oxygen, nucleophilic attack by the amine forms carbinolamine 1; 2. Proton transfer and elimination of water forms iminium ion 2; he enol form of the dicarboxylate ester attacks the iminium ion to form adduct 3; 4. Adduct 3 tautomerizes...
250 ChemActivity 29 Electrophilic Aromatic Substitution no ChemActivity 29 Part A: Electrophilic Aromatic Substitution (What products are formed when a strong electrophile is added to benzene?) Model 1: (review) Electrophilic Addition of HCI Rani o g cyclohexene carbocation intermediate Run 2 U X benzene This product carbocation intermediate DOES NOT Critical Thinking Questions 1 For Rxn I (above) draw curved arrows showing the mechanism of electrophilic addition of HCl. Include an appropriate carbocation intermediate in the box above. Figure 1:...
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