Organic Chemistry
7th Edition
ISBN: 9780321803221
Author: Paula Y. Bruice
Publisher: Prentice Hall
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Textbook Question
Chapter 10.3, Problem 6P
If 2-fluoropentane could undergo an E1 reaction, would you expect the major product to be the more stable
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3. Please draw the most important (stable) resonance form of the carbonation that
mediates the following reaction:
OH H3O+
O
4. Draw the structure of the alkene isomer (with the molecular formula of C5H10) that is
most reactive one in the addition reaction with Br₂.
H3C
CH3
H3C
NA C→XT
Br
Br₂
CH₂Cl₂
H3C
Electrophilic addition of bromine, Br₂, to alkenes yields a 1,2-dibromoalkane. The reaction proceeds through a cyclic
intermediate known as a bromonium ion. The reaction occurs in an anhydrous solvent such as CH₂Cl₂.
CH3
Br
In the second step of the reaction, bromide is the nucleophile and attacks at one of the carbons of the bromonium ion
to yield the product. Due to steric clashes, the bromide ion always attacks the carbon from the opposite face of the
bromonium ion so that a product with anti stereochemistry is formed.
Draw curved arrows to show the movement of electrons in this step of the mechanism.
Arrow-pushing Instructions
Br
CH3
H3C
CH3
draw the two possible carbocations that can form when this alkene reacts with a strong acid (such as HBr or H3O+). of the two structures you drew, circle the more stable carbocation
Chapter 10 Solutions
Organic Chemistry
Ch. 10.2 - Prob. 1PCh. 10.2 - Prob. 2PCh. 10.2 - Prob. 3PCh. 10.2 - Prob. 4PCh. 10.3 - Four alkenes are formed from the E1 reaction of...Ch. 10.3 - If 2-fluoropentane could undergo an E1 reaction,...Ch. 10.3 - Prob. 7PCh. 10.3 - Propose a mechanism for the following reaction:Ch. 10.4 - Prob. 9PCh. 10.4 - What products will be obtained from the El...
Ch. 10.4 - Prob. 11PCh. 10.5 - Prob. 12PCh. 10.6 - Prob. 14PCh. 10.7 - Why do cis-1-bromo-2-ethylcyclohexane and...Ch. 10.7 - Which isomer reacts more rapidly in an E2...Ch. 10.7 - Prob. 18PCh. 10.8 - Prob. 19PCh. 10.8 - Prob. 20PCh. 10.9 - Prob. 21PCh. 10.9 - Explain why only a substitution product and no...Ch. 10.9 - Prob. 23PCh. 10.9 - Prob. 24PCh. 10.9 - Prob. 25PCh. 10.9 - a. Explain why 1-bromo-2,2-dimethylpropane has...Ch. 10.10 - A small amount of another organic product is...Ch. 10.10 - What is the best way to prepare the following...Ch. 10.10 - Prob. 29PCh. 10.10 - Prob. 30PCh. 10.10 - Why is a cumulated diene not formed in the...Ch. 10.10 - What product is obtained when the following...Ch. 10.11 - Prob. 33PCh. 10.11 - Prob. 34PCh. 10 - Draw the major product obtained when each of the...Ch. 10 - Prob. 36PCh. 10 - a. Indicate how each of the following factors...Ch. 10 - Prob. 38PCh. 10 - A chemist wanted to synthesize the...Ch. 10 - Prob. 40PCh. 10 - Prob. 41PCh. 10 - Prob. 42PCh. 10 - Starting with an alkyl halide, how could the...Ch. 10 - Indicate which species in each pair gives a higher...Ch. 10 - Prob. 45PCh. 10 - For each of the following alkyl halides, indicate...Ch. 10 - Prob. 47PCh. 10 - When 2-bromo-2,3-dimethylbutane reacts with a...Ch. 10 - Prob. 49PCh. 10 - When the following compound undergoes solvolysis...Ch. 10 - cis-1-Bromo-4-tert-butylcyclohexane and...Ch. 10 - Draw the substitution and elimination products.Ch. 10 - Prob. 53PCh. 10 - Prob. 54PCh. 10 - Which of the following hexachlorocyclohexanes is...Ch. 10 - Explain why the rate of the reaction of...Ch. 10 - Prob. 57PCh. 10 - Two elimination products are obtained from the...Ch. 10 - Draw the structures or the product of the obtained...Ch. 10 - How could you prepare the following compounds from...Ch. 10 - cis-4-Bromocyclohexanol and...Ch. 10 - Prob. 62PCh. 10 - Prob. 63P
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- 1. Reaction of 2,3-dimethyl-1-butene with HBr leads to an alkyl bromide, C6H13Br. On treatment of this alkyl halide with KOH in methanol, elimination of HBr occurs and a hydrocarbon that is isometric with the starting alkene is formed. What is the structure of this hydrocarbon and how do you think it is formed from an alkyl bromide? 2. 1-Octen-3-ol is a potent mosquito attractant commonly used in mosquito traps. A number of reactions, including hydrogenation, will transform 1-Octen-3-ol into a less effective molecule. Write a complete reaction equation for the hydrogenation of this alkenol.arrow_forward2. The following carbocation is generated as an intermediate in the addition of H-Br to an alkene. Draw the structure of all possible alkenes that could have formed this intermediate.arrow_forwardIf the Product of this Suzuki reaction is 4-(4-methylphenyl)benzaldehyde, what are the two starting reagents. Please write the name of the structures along with the drawing of the starting reagents.arrow_forward
- 5A In the following reactions, mixtures of alkenes and ethyl ethers are formed. Draw their structures. Explain which is or are likely to be the main product(s) in each reaction. In case of formation of two isomers of alkenes, explain which is formed in greater proportion CH3 ofi H3C- -Br CH3 EtOHarrow_forward5. Which of the following alkenes will react most quickly with HBr? Bubble in your answer completely. O 6. Which of the following alkenes will give only one single product upon reaction with HBr? Consider both regio- and stereoisomerism. Bubble in your answer completely. o σ α xarrow_forward10) Synthesis: Make the following products from a suitable cyclic alkene starting material. Look at the functional group PATTERN present in the molecule, including stereochemistry. ♡ Br Brarrow_forward
- 1. Predict the product(s) and propose a mechanism of the following nucleophilic substitution reaction. Remember that a mechanism should contain arrows to show movement of electrons, all intermediates and appropriate formal charges. Br + H₂O →arrow_forwardThe reaction of Hbr with 2-methylpropene produces 2-bromo-2-methylpropane. What is the structure of the carbocation formed during the reaction?arrow_forward6) You have decided to repeat the reaction from Question 5 using a slightly different alkene starting material. You now observe 3 products, and you suspect that your major product (Product A) is the result of a carbocation rearrangement. Draw the mechanism for the formation of Product A and indicate which type of carbocation rearrangement has occurred. H₂O H₂SO4 A OH 67% Major Product B OH 32% Minor Product C 1% OHarrow_forward
- 2-chloropropane is a major product of the reaction of chlorine with propane under ultraviolet light. Write the mechanism for this reaction including the initiation step and the two propagation steps.arrow_forwardWhat about the second step in the electrophilic addition of HCl to an alkene-the reaction of chloride ion with the carbocation intermediate? Is this step exergonic or endergonic? Does the transition state for this second step resemble the reactant (carbocation) or the product (alkyl chloride)? Make a rough diagram of what the transition state may look like?arrow_forwardHydroxylation of E-2-pentene with osmium tetroxide yields a different product than the same reaction using the Z configuration. Draw the structures of the alkenes and show the stereochemistry for each product. Explain any differences between them.arrow_forward
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