5. Why is Iodide such a good nucleophile? 9. Iodide is a good nucleophile and also...
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5.
Why is Iodide such a good nucleophile?
9. Iodide is a good nucleophile and also...
1. In the SN1 mechanism, the second step is attack of the nucleophile, so increasing the...
1. In the SN1 mechanism, the second step is attack of the nucleophile, so increasing the nucleophile concentration should speed up this step. Why, then, do we say that the rate of an SN1 reaction does not depend on the concentration of the nucleophile? 2. If one wants to select a substrate that will react in both SN1 and SN2 reactions, what substrate structure characteristics are desirable? 3. Iodide is a good nucleophile and also a good leaving group. Yet...
1. In both the sodium iodide test and the silver nitrate test, why does 2-bromobutane react faster...
1. In both the sodium iodide
test and the silver nitrate test, why does 2-bromobutane react
faster than 2-chlorobutane?
Bromine is a better leaving group since it is a weaker base than
chlorine is.
2. a. Why does benzyl chloride react under both
SN1 and SN2 conditions?
Benzyl
chloride is a primary alkyl halide, hence reactive under SN2
conditions.
The
primary carbocation formed due to the departure of Cl- is
stabilized by the pi electrons in the benzene ring.
b. Why is...
Explain the following statements. MeOH is NOT a good solvent for S_N2 reaction. Hexane is NOT...
Explain the following statements. MeOH is NOT a good solvent for S_N2 reaction. Hexane is NOT a good solvent for S_N1/S_N2 reaction. Acetone is a good solvent for S_N2 reaction. Iodide is a better leaving group than chloride. Tosylate is a better leaving group than iodide. (CH_3)_3CO^- is a stronger base than CH_3CH_2O. CH_3CH_2NH_2 is a stronger nucleophile than CH_3CH_2OH.
I have a question about nucleophile concentration and the dilution process. Why does 25:75 mix -...
I have a question about nucleophile concentration and the dilution process. Why does 25:75 mix - .25 mL 18% solution of sodium iodide in acetone and .75mL of acetone have a faster reaction rate for 1-bromobutane than 1 mL 18% solution of sodium iodide in acetone ? I would appreciate it
hypothesize why a tertiary alcohol is a good solvent for an sn2 reaction where CsF is...
hypothesize why a tertiary alcohol is a good solvent for an sn2 reaction where CsF is the nucleophile and iodide is the leaving group there are various electrophiles that iodide is leaving from who's identities don't seem to matter. from everything I've learned up to now protic solvents are NOT good solvents for sn2 rxns. there have been numerous articles on a research project where 18F is being used for radiolabeling in biological systems and they used tert-amy-alcohol for the...
The rate-determining step also involves the nucleophile. What is the nucleophile in the given SN2 reactions?...
The rate-determining step also
involves the nucleophile. What is the nucleophile in the given SN2
reactions? Why does this nucleophile favor an SN2 reaction?
Introduction Up until now, we have been focusing on general laboratory techniques used in synthesizing, purifying and characterizing organic compounds. Today's experiment begins the transition to synthesis itself. The field of synthetic chemistry draws upon known reaction mechanisms to devise novel compounds or to devise ways of producing in the lab compounds that already exist in...
5) Iodine is a better leaving group than bromine. But iodine is a better nucleophile than bromine. Why is that? Introdu...
5) Iodine is a better leaving group than bromine. But iodine is
a better nucleophile than bromine. Why is that?
Introduction Alkyl halides can be prepared from alcohols by reactions with hydrogen halides (HCI, HBr, or HI) via nucleophilic substitution. In this type of reaction, the nucleophile displaces a leaving group from a carbon atom of an organic substrate (here the alcohol once protonated). Both electrons of the new bond to the carbon are provided by the nucleophile while the...
3. An alkyl halide is reacted with sodium iodide and sodium chloride in separate test tubes....
3. An alkyl halide is reacted with sodium iodide and sodium chloride in separate test tubes. The rate was the same in both experiments. Is this an Syl or an SN2 reaction? How would you know? 4. Why is sodium iodide used as a solution in acetone in these experiments instead of a solution in water? 5. Will the reaction below be Spl or Sn2? Show the mechanism.
5. (a) The following is a substitution reaction using a sulfonium ion, which has a sulfur-based...
5. (a) The following is a substitution reaction using a sulfonium ion, which has a sulfur-based leaving group, rather than an alkyl halide. Four different nucleophiles were used in the substitution reaction and their rates were measured Rationalize the trend in reaction rates and indicate the dominant mechanism in each case Nu SPh2 Ph OH SH Rate 3.9 3.8 74 257 (b) (R)-2-Bromooctane was stirred with excess sodium iodide in acetone at room temperature for 2 days. Write an equation...
9) What are we removing with the water wash? Why don’t we just add the sodium...
9) What are we removing with the water wash? Why don’t we just
add the sodium bicarbonate directly to the reaction mixture instead
of doing a water wash? 10) Provide the results of the silver
nitrate test.
Introduction Alkyl halides can be prepared from alcohols by reactions with hydrogen halides (HCl, HBr, or HI) via nucleophilic substitution. In this type of reaction, the nucleophile displaces a leaving group from a carbon atom of an organic substrate (here the alcohol once...
1. In both the sodium iodide
test and the silver nitrate test, why does 2-bromobutane react
faster than 2-chlorobutane?
Bromine is a better leaving group since it is a weaker base than
chlorine is.
2. a. Why does benzyl chloride react under both
SN1 and SN2 conditions?
Benzyl
chloride is a primary alkyl halide, hence reactive under SN2
conditions.
The
primary carbocation formed due to the departure of Cl- is
stabilized by the pi electrons in the benzene ring.
b. Why is...
Explain the following statements. MeOH is NOT a good solvent for S_N2 reaction. Hexane is NOT a good solvent for S_N1/S_N2 reaction. Acetone is a good solvent for S_N2 reaction. Iodide is a better leaving group than chloride. Tosylate is a better leaving group than iodide. (CH_3)_3CO^- is a stronger base than CH_3CH_2O. CH_3CH_2NH_2 is a stronger nucleophile than CH_3CH_2OH.
The rate-determining step also
involves the nucleophile. What is the nucleophile in the given SN2
reactions? Why does this nucleophile favor an SN2 reaction?
Introduction Up until now, we have been focusing on general laboratory techniques used in synthesizing, purifying and characterizing organic compounds. Today's experiment begins the transition to synthesis itself. The field of synthetic chemistry draws upon known reaction mechanisms to devise novel compounds or to devise ways of producing in the lab compounds that already exist in...
5) Iodine is a better leaving group than bromine. But iodine is
a better nucleophile than bromine. Why is that?
Introduction Alkyl halides can be prepared from alcohols by reactions with hydrogen halides (HCI, HBr, or HI) via nucleophilic substitution. In this type of reaction, the nucleophile displaces a leaving group from a carbon atom of an organic substrate (here the alcohol once protonated). Both electrons of the new bond to the carbon are provided by the nucleophile while the...
3. An alkyl halide is reacted with sodium iodide and sodium chloride in separate test tubes. The rate was the same in both experiments. Is this an Syl or an SN2 reaction? How would you know? 4. Why is sodium iodide used as a solution in acetone in these experiments instead of a solution in water? 5. Will the reaction below be Spl or Sn2? Show the mechanism.
5. (a) The following is a substitution reaction using a sulfonium ion, which has a sulfur-based leaving group, rather than an alkyl halide. Four different nucleophiles were used in the substitution reaction and their rates were measured Rationalize the trend in reaction rates and indicate the dominant mechanism in each case Nu SPh2 Ph OH SH Rate 3.9 3.8 74 257 (b) (R)-2-Bromooctane was stirred with excess sodium iodide in acetone at room temperature for 2 days. Write an equation...
9) What are we removing with the water wash? Why don’t we just
add the sodium bicarbonate directly to the reaction mixture instead
of doing a water wash? 10) Provide the results of the silver
nitrate test.
Introduction Alkyl halides can be prepared from alcohols by reactions with hydrogen halides (HCl, HBr, or HI) via nucleophilic substitution. In this type of reaction, the nucleophile displaces a leaving group from a carbon atom of an organic substrate (here the alcohol once...
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