**Alkyne Reactions with HBr and Br₂: Major Products****8. Give the major product for each reaction.**1. **Reaction with HBr (1 equivalent):** - **Starting Compound:** An alkyne. - **Reagent:** HBr (1 equivalent). - **Explanation:** The alkyne reacts with one equivalent of HBr, resulting in the formation of a bromoalkene as the major product.2. **Reaction with HBr (excess), symmetrical alkyne:** - **Starting Compound:** A symmetrical alkyne. - **Reagent:** HBr (excess). - **Explanation:** The symmetrical alkyne undergoes a more extensive reaction with an excess of HBr, leading to the formation of a dibromoalkane as the major product.3. **Reaction with HBr (excess):** - **Starting Compound:** An unsymmetrical alkyne. - **Reagent:** HBr (excess). - **Explanation:** In this case, two products are formed due to the unsymmetrical nature of the alkyne. The reaction results in the addition of two bromine atoms across the triple bond.4. **Reaction with Br₂ (1 equivalent):** - **Starting Compound:** An alkyne. - **Reagent:** Br₂ (1 equivalent). - **Explanation:** The alkyne reacts with one equivalent of Br₂, resulting in the formation of a dibromoalkene as the major product.5. **Reaction with HBr, in the presence of ROOR:** - **Starting Compound:** An alkyne. - **Reagent:** HBr in the presence of ROOR (a radical initiator). - **Explanation:** The presence of ROOR leads to a radical addition pathway, resulting in two products. The exact nature of the major products depends on the regioselectivity controlled by radical mechanism and the structure of the starting alkyne.These reactions and their products are fundamental in organic chemistry, particularly in the study of addition reactions of alkynes. Understanding the product formations from these reactions is crucial for further exploring the synthesis and reactivity of organic compounds.

HBr add in cis manner to alkyne forms alkene if HBr present in 1 equivalent.

Answered: 8. Give the major product for each. HBr…

8. Give the major product for each. HBr HBr (1 eq) excess HBr HBr excess excess symmetrical alkyne (2 products) Br2 HBr (1 еq) ROOR (2 products)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Related questions

Q: CH3 CH;CI. Mg D ether MnO2 Br2 NaOH A Br2 E F FeBr3 hv

A: In organic chemistry, a substitution reaction is that in which one group, called a leaving group, is…

Q: Predict the major organic product of the reaction. An alkene has one substituent, a tert butyl…

A: Alkene reacts with HBr to produce an alkyl bromide.

Q: Provide the major organic product of the following reaction. HCO. H3CO CO₂CH3 Δ

A: We have to predict the correct product.

Q: Determine the product of the following reaction. 1. CEC-H С-н 2. H.O н H3C Он но Н- H3C H3C Н,с н…

A: Since in the above reaction, the Neuclophile will attack from the position where we have most delta…

Q: What is the major organic product obtained from the following reaction? H₂Cr₂O7 H₂SO4, H₂O OH A)…

A: Chromic acid (produced by the reaction between H2Cr2O7, H2SO4 and H2O) oxidized primary alcohol to…

Q: Predict the product of the reaction. H H H H H H H H H H + Cl₂ light product + HCI Modify the given…

A: To find out the structure of product and also give the IUPAC name.

Q: Which is the major organic product from the following reaction? LOH 1. Br2, PBrg OH 2. H,0*

A: From the given reaction the major organic product can be identified as

Q: What is the major organic product for the following reaction? xs. Br2 CI4

A: First alkyne react with Bromine to form three-member cyclic intermediate, then Br- attack with…

Q: What is(are) the major product(s) of the following reaction? Hg(OAc)2/CH3OH WAN 3 2 and 3 OCH3 1. 2.…

A: In an oxymercuration–demercuration response, an alkene is dealt with with mercury(II) acetate,…

Q: Indicate the major organic product that would be formed under the conditions below: 1. ВН3 THF 2.…

Q: HBr Br (CH)b HO TSCI ridine COTS SOH Br NaH NBS |C, но Br "O., CI

A: The question is based on the concept of organic reactions. We have to convert the reactant into…

Q: What is the major organic product of the following reaction? xs NABH4 H. CH3OH OCH3 OH OH OH OH…

Q: 7. What is the major product of the following reaction? obr NaNH, 2. H₂O*

Q: For the following reactions, draw the MAJOR product(s). 1) Hg(OAc)2, H2O 2) NaBH4

Q: Give the major product(s) of the following reaction.

A: Alkenes are hydrogenated by the reaction with hydrogen in presence of a nickel, platinum, or…

Q: What is the expected major product of this reaction? OH H₂N Oll - ||| H₂N H₂N || 85% H3PO4, A H₂N ?…

A: The given reaction is an example of ring expansion which involves the alkyl shift.

Q: 1- Which product is formed from the following transformation: 1. excess CH₂MgBr 2. H₂O*

A: Given,The reaction:

Q: Consider the product distribution of the following reaction. Use curved arrows to show the formation…

A: A carbocation is a positively charged carbon atom.It is considered to be an important intermediate…

Q: Draw the product(s) of the following reactions. 1. BH, / THF 2. H,O2 / aqueous NaOH…

A: The reaction is the conversion of alkynes into ketones. Boron attaches with less substituted sp…

Q: the major organic product obtained from the following reaction? W 1. NaBH₂ H 2 H₂O sesse

A: NaBH4 is a mild reducing agent, it can only oxidise aldehyde and ketone to alcohol. It converts…

Q: Draw the major product of this reaction. Ignore inorganic byproducts. 1. NaNO2, H₂SO4 2. CuCN NH₂ 母

Q: 1-bromo-5-chloropentane LDA 1 eq a) Hg(OAc)2 b) NaBH NaOH (1 eq) CHOO Note this product has a ring.…

A: Step 1:a) In this reaction, • LDA is the strong base which will abstract most acidic proton to…

Q: For each of the following reactions, predict the major product. NaOH H20 1. NaH 2. О 3. HCI, H20, Д…

Q: 2. If the excess salt is dissolved in water, it will reform carbamic acid. At 350K, carbamic acid…

Q: What is the major organic product of the following reaction? H* (cat.) + HO, О НО ОН

Q: Give the starting alkene and any other reagents needed to selectively make the following compounds…

A: 4. We have to give the starting alkenes and the reagents that selectively give those desired…

Q: What is the major organic product obtained from the following reaction? OH OH 1.2 eq. CH3M9CI OCH 2.…

A: We will write mechanism of both steps of the reaction, then estimate the final product of the…

Q: select all major products of the following reactions. 1. H2, Pd, MEOH quinoline, Pb(OAc)2. Caco, Me…

Q: What is the major product from the following reaction? 1.CH,MgBr 2.11,0 OH OH 3D 11 III IV

A: Answer:- This question is answered by using the simple concept of chemical reaction of aldehydes…

Q: Give the major product of the following reaction. Br H₂ OH Pt OMe There is no reaction under these…

Q: Give the major product(s) of the following reaction. Cro;CH OH N.

Q: What is the major product from the following reaction? H OCH₂ 1. CH-MgBr (2 cq.) 2. H₂O 11 OH 111 OH…

A: Grignard reagent is a chemical compound that shows the general formula R-Mg-X, where X is a halogen…

Q: Give the major product of the reaction shown below. ? Cl₂ H₂O I CI OH Do IV O Compound I O Compound…

A: X2, H2O form HOX and then adds to alkene to form the addition product.The addition takes place…

Q: What is the major organic product of the following reaction? H20, H2SO, HgSO, OH %3D IV

Q: What is the major product to the following reaction? 1. BH3-THF 2. NaOH, H2O2, H20

Q: What is the product of the following reaction? 1) H,O, H,SO4, H9SO, 2) NaBH4, MEOH

A: “Since you have asked multiple question, we will solve the first question for you as per our…

Q: O= Predict the product of this reaction. Show each intermediate in the reaction path. Use curly…

A: An arrow always depicts from a region of high electron density to low electron density ; that is…

Q: What is the product of the following set of reactions? 1. BH3-THF HOT ..... Me 2. SOC, ElN NEt2 HO…

Q: Select to Draw HBr 1. BH3-THF 2. H2O2, NaOH Select to Draw d Select to Draw Cl₂ H₂O 1.03 2. (CH3)2S…

Q: What is the major organic product of the following reaction? Br₂ Br SH Br || - SH = III hoory IV

A: Thiol in presence of bromine or iodine form disulphide.

Concept explainers

Reactions of Ethers

Ethers (R-O-R’) are compounds formed by replacing hydrogen atoms of an alcohol (R-OH compound) or a phenol (C6H5OH) by an aryl/ acyl group (functional group after removing single hydrogen from an aromatic ring). In this section, reaction, preparation and behavior of ethers are discussed in the context of organic chemistry.

Epoxides

Epoxides are a special class of cyclic ethers which are an important functional group in organic chemistry and generate reactive centers due to their unusual high reactivity. Due to their high reactivity, epoxides are considered to be toxic and mutagenic.

Williamson Ether Synthesis

An organic reaction in which an organohalide and a deprotonated alcohol forms ether is known as Williamson ether synthesis. Alexander Williamson developed the Williamson ether synthesis in 1850. The formation of ether in this synthesis is an SN2 reaction.

Question

**Alkyne Reactions with HBr and Br₂: Major Products**

**8. Give the major product for each reaction.**

1. **Reaction with HBr (1 equivalent):**
- **Starting Compound:** An alkyne.
- **Reagent:** HBr (1 equivalent).
- **Explanation:** The alkyne reacts with one equivalent of HBr, resulting in the formation of a bromoalkene as the major product.

2. **Reaction with HBr (excess), symmetrical alkyne:**
- **Starting Compound:** A symmetrical alkyne.
- **Reagent:** HBr (excess).
- **Explanation:** The symmetrical alkyne undergoes a more extensive reaction with an excess of HBr, leading to the formation of a dibromoalkane as the major product.

3. **Reaction with HBr (excess):**
- **Starting Compound:** An unsymmetrical alkyne.
- **Reagent:** HBr (excess).
- **Explanation:** In this case, two products are formed due to the unsymmetrical nature of the alkyne. The reaction results in the addition of two bromine atoms across the triple bond.

4. **Reaction with Br₂ (1 equivalent):**
- **Starting Compound:** An alkyne.
- **Reagent:** Br₂ (1 equivalent).
- **Explanation:** The alkyne reacts with one equivalent of Br₂, resulting in the formation of a dibromoalkene as the major product.

5. **Reaction with HBr, in the presence of ROOR:**
- **Starting Compound:** An alkyne.
- **Reagent:** HBr in the presence of ROOR (a radical initiator).
- **Explanation:** The presence of ROOR leads to a radical addition pathway, resulting in two products. The exact nature of the major products depends on the regioselectivity controlled by radical mechanism and the structure of the starting alkyne.

These reactions and their products are fundamental in organic chemistry, particularly in the study of addition reactions of alkynes. Understanding the product formations from these reactions is crucial for further exploring the synthesis and reactivity of organic compounds.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.

Similar questions

Give the major product(s) of the following reaction. 1) ВН/THF 2) НООН, NaОН 4. HO- OH OH U There is no reaction under these conditions or the correct product is not listed here.
What is the major product of this reaction? OCH3 Мосн ✗OCH, +Ph 1. NaOCH3 major product 2. H₂O* A C Ph OCH3 Ph B Ph HO Ph O Ph D
Give the major product(s) of the following reaction. NaCN ofe of CN OH Br OH Br OH CN OH O There is no reaction under these conditions or the correct product is not listed here.
What is the expected product of the reaction shown? H3C 1(CH3)2NH 2.H20 H3C. он N(CH3)2 OH H;C ZHN" H;C OH (H;C),N IV II CH3 OI O II OIV
Predict the product(s) of the following reaction. conc. HBr 2.
Choose the correct product for the given reaction. CF3 HBr ? CF3 CF3 Br A. Br Br CF3 Br CF3 D. Br С. Br A B B. ооо о
7) Provide the structure of the major organic product in the following reaction. HOT 7a) 7b) 7c) CH3 H3CO. H3CO. H3CO. CI. H. CN X· X- NC H 7d) H3CO CI CO₂CH3 A A A
Give the major product of the following reaction. H H OH OH H H 1) 03 2) Zn, H₂O ? HO OH O There is no reaction under these conditions or the correct product is not listed here.
Which is the major product of the following reaction? 0- OH CH,Cl2 HO но он II IV ||
1. Predict the product for the following reaction. hem H₂SO4 -H₂O 2. Predict the product for the following reaction. PPh ₂CHCH3
Select all major products of the following reactions. Me Br2 -Me MeOH B Me C Me D E Me A Me MeQ Me Br Br OMe OMe Br "Me "Me 'Me "Me "Me OMe OMe Br Br
Give the major product of the following reaction. 1) O3 2) Zn, H20