Describe each for E1/E2 reactions: A. Difference in substrate preference B. Possible rearrangements C. Leaving groups...
Describe each for E1/E2 reactions:
A. Difference in substrate preference
B. Possible rearrangements
C. Leaving groups
D. types of base
E. competition with substitution
Homework Answers
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Describe each for E1/E2 reactions:
A. Difference in substrate preference
B. Possible rearrangements
C. Leaving groups...
Compare and contrast SN1, SN2, E1 and E2 reactions. What are some obvious similarities and differences...
Compare and contrast SN1, SN2, E1 and E2 reactions. What are some obvious similarities and differences between each reaction pathway? What are the requirements for each reaction to work? Discuss why SN2 is in direct competition with E2 while SN1 is in direct competition with the E1 reaction pathway. What is the rate expression for each? Which reactions are concerted? Which reactions are step-wise? Which reactions are stereospecific and what is the stereospecificity of each that are? How do the...
1) Compare and contrast SN1, SN2, E1, and E2 reactions! (similarities abd differences. Requirements for each...
1) Compare and contrast SN1, SN2, E1, and E2 reactions!
(similarities abd differences. Requirements for each to
work.)
2) Why is SN2 is in direct competition with E2 while SN1 is
direct competition with E1 reaction.
3) Rate expression of each
4) which reactions are concerted? Which are atep wise?
5) which are sterospecific and what stereospecificity of each
are?
6) how do the variables below (A-D) influence reaction
pathway?
Compare and contrast SNI, SN2, El and E2 reactions. What...
1.(1 pt. each) Consider the following statements regarding Syl, SN2, E1 and E2 reactions. To which...
1.(1 pt. each) Consider the following statements regarding Syl, SN2, E1 and E2 reactions. To which mechansims, if any, does each statement apply? If the statement can be applied to more than one mechanism, indicate each mechanism. SNI a) Involves a carbocation intermediate SNIEL b) Substitution at a stereocenter give predominantly a racemic product c) Rearrangements of the carbon skeleton are possible. EL SM d) Is greatly accelerated in protic solvents of increasing polarity SN e) Is first order in...
QUESTION 7 Consider the biochemical pathway A+E1 --> B+E2 --> C, where A, B, and Care...
QUESTION 7 Consider the biochemical pathway A+E1 --> B+E2 --> C, where A, B, and Care substrates and products and E1 and E2 are the enzymes that catalyze the reactions. Enzyme 1 (E1) can utilize only B as substrate. O only A as substrate. both A and B as substrates either A or B as substrate, but not both. neither A nor B as substrate.
н.W. 10-E2, E1, Sn1 and Sn2 Each substrate undergoes E2 elimination with NaOCHs. Draw the ß-hydrogens,...
н.W. 10-E2, E1, Sn1 and Sn2 Each substrate undergoes E2 elimination with NaOCHs. Draw the ß-hydrogens, then draw each possible elimination product, and identify the major isomer. The first is shown as an example. Notice he base is a strong base which promotes 2nd order mechanisms Br Br major No need to draw all beta-hydrogens if they are equivalent. minor NaOCH Br Br Br Br
For each of the following reactions, determine which ELIMINATION mechanism (E1 or E2) will occur. Alkyl...
For each of the following reactions, determine which ELIMINATION mechanism (E1 or E2) will occur. Alkyl Halide Substitution: Methyl 1° 2° 3° Base Strength: Strong Weak Mechanism Type: E1 E2 Draw the mechanism that leads to ALL products for the reaction. Finally, underline the major product of the elimination reaction: H3C OH H2C H2C1 Br CHE
12. Label the following reactions as El or E2 * 01 - 0 a . CH...
12. Label the following reactions as El or E2 * 01 - 0 a . CH CH -- A. A =E1; B=E2 B.A=E1; B=E1 C. A E2: B-EI D. A=E2; B-E2 13. Consider the following exothermic E2 reaction. What rate equation would be observed for this reaction CH, CH CH I + KOC(CH3), CH CH CH2 + KI A. rate k[CHCH:CH-1) B. rate=k[CH,CH:CH:1][K OC(CH.)s] C. rate - [CH,CH:CH=1][K OC(CH);]* D. rate=k[CH,CH:CH-1)^[K OC(CH.):] E. There is not enough information given to...
For letters h & i : For each of the following reactions, predict the major mechanistic pathway (SN1/SN2/E1/E2...
For
letters h & i :
For each of the following reactions, predict the major
mechanistic pathway (SN1/SN2/E1/E2) and the major organic
products
1. (cont.) (h) НСОН CHB -CHBr HCOH - (0) CH,CH,CH,CH,Br- NH 2. For each of the following indicate which reaction will occur faster. Explain your reasoning. (No credit will be given for guesses) (a) The reaction of (CH),CBr with 0.001M aqueous NaOH or 0.10M aqueous NaOH (b) The reaction of 2-bromobutane with NaOH in DMSO or NaSH...
E1 and E2 Reactions: Predicted Ability: Good Average Poor Actual Ability: Good Average Poor When determining...
E1 and E2 Reactions: Predicted Ability: Good Average Poor Actual Ability: Good Average Poor When determining which mechanism (E1 or E2) occurs, the following process is helpful: 1) Determine the substitution (methyl, 1º, 2º, or 3º) of the alkyl halide 2) Determine the strength of the nucleophile Please fill out the following table, indicating the category of reaction (E1 or E2) that will occur in each set of alkyl halides and nucleophiles. If no reaction occurs, write 'NR:' Alkyl Halide...
sn1,sn2,e1,e2 please help! a)asses substrate b) classify reagents (nuc/base, strong or weak) c)solvent used if not...
sn1,sn2,e1,e2
please help! a)asses substrate b) classify reagents (nuc/base, strong or weak) c)solvent used if not indicated d)mechanism type e)major & minor products including stereochemistry & geometry 15. 1. НаО* 2. EtOH Он 16. OTs
1) Compare and contrast SN1, SN2, E1, and E2 reactions!
(similarities abd differences. Requirements for each to
work.)
2) Why is SN2 is in direct competition with E2 while SN1 is
direct competition with E1 reaction.
3) Rate expression of each
4) which reactions are concerted? Which are atep wise?
5) which are sterospecific and what stereospecificity of each
are?
6) how do the variables below (A-D) influence reaction
pathway?
Compare and contrast SNI, SN2, El and E2 reactions. What...
1.(1 pt. each) Consider the following statements regarding Syl, SN2, E1 and E2 reactions. To which mechansims, if any, does each statement apply? If the statement can be applied to more than one mechanism, indicate each mechanism. SNI a) Involves a carbocation intermediate SNIEL b) Substitution at a stereocenter give predominantly a racemic product c) Rearrangements of the carbon skeleton are possible. EL SM d) Is greatly accelerated in protic solvents of increasing polarity SN e) Is first order in...
QUESTION 7 Consider the biochemical pathway A+E1 --> B+E2 --> C, where A, B, and Care substrates and products and E1 and E2 are the enzymes that catalyze the reactions. Enzyme 1 (E1) can utilize only B as substrate. O only A as substrate. both A and B as substrates either A or B as substrate, but not both. neither A nor B as substrate.
н.W. 10-E2, E1, Sn1 and Sn2 Each substrate undergoes E2 elimination with NaOCHs. Draw the ß-hydrogens, then draw each possible elimination product, and identify the major isomer. The first is shown as an example. Notice he base is a strong base which promotes 2nd order mechanisms Br Br major No need to draw all beta-hydrogens if they are equivalent. minor NaOCH Br Br Br Br
For each of the following reactions, determine which ELIMINATION mechanism (E1 or E2) will occur. Alkyl Halide Substitution: Methyl 1° 2° 3° Base Strength: Strong Weak Mechanism Type: E1 E2 Draw the mechanism that leads to ALL products for the reaction. Finally, underline the major product of the elimination reaction: H3C OH H2C H2C1 Br CHE
12. Label the following reactions as El or E2 * 01 - 0 a . CH CH -- A. A =E1; B=E2 B.A=E1; B=E1 C. A E2: B-EI D. A=E2; B-E2 13. Consider the following exothermic E2 reaction. What rate equation would be observed for this reaction CH, CH CH I + KOC(CH3), CH CH CH2 + KI A. rate k[CHCH:CH-1) B. rate=k[CH,CH:CH:1][K OC(CH.)s] C. rate - [CH,CH:CH=1][K OC(CH);]* D. rate=k[CH,CH:CH-1)^[K OC(CH.):] E. There is not enough information given to...
For
letters h & i :
For each of the following reactions, predict the major
mechanistic pathway (SN1/SN2/E1/E2) and the major organic
products
1. (cont.) (h) НСОН CHB -CHBr HCOH - (0) CH,CH,CH,CH,Br- NH 2. For each of the following indicate which reaction will occur faster. Explain your reasoning. (No credit will be given for guesses) (a) The reaction of (CH),CBr with 0.001M aqueous NaOH or 0.10M aqueous NaOH (b) The reaction of 2-bromobutane with NaOH in DMSO or NaSH...
E1 and E2 Reactions: Predicted Ability: Good Average Poor Actual Ability: Good Average Poor When determining which mechanism (E1 or E2) occurs, the following process is helpful: 1) Determine the substitution (methyl, 1º, 2º, or 3º) of the alkyl halide 2) Determine the strength of the nucleophile Please fill out the following table, indicating the category of reaction (E1 or E2) that will occur in each set of alkyl halides and nucleophiles. If no reaction occurs, write 'NR:' Alkyl Halide...
sn1,sn2,e1,e2
please help! a)asses substrate b) classify reagents (nuc/base, strong or weak) c)solvent used if not indicated d)mechanism type e)major & minor products including stereochemistry & geometry 15. 1. НаО* 2. EtOH Он 16. OTs
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