Provide the major product expected for the following reactions. Omit byproducts. Ignore stereochemistry. Hint: if more...
Provide the major product expected for the following reactions. Omit byproducts. Ignore stereochemistry. Hint: if more than one product is possible, draw only the one that fits in the context of this two-step scheme.
Homework Answers
• Allylic bromination is the replacement of hydrogen atom by bromine atom at allylic position.
• The allylic position is adjacent to carbon position to the double bond. NBS (N-Bromo Succinimide) is used for brominating at allylic positions, in the presence of peroxides, light or heat.
• E2 elimination reaction is a bi-molecular elimination reaction.
• This elimination process is a single-step process, which follows the concerted mechanism.
• In E2 elimination reaction, the intermediate is in a transition state.
Allylic bromination undergoes through a free radical mechanism by NBS in the presence of peroxides, light or heat.
NBS is catalyzed by the , which is present in NBS as a small quantity. That is how the direct bromination of double bond is controlled. acts as a solvent in this reaction.
This reaction undergoes a radical chain of reactions, which consist of mainly three steps:
I. Initiation
II.Propagation
III.Termination
E2 elimination reaction: The rate of the reaction depends on both, the base and the substrate. Therefore, the E2 elimination reaction is known as the bi-molecular elimination reaction.
NBS catalyzed reaction by is shown below.
The hemolytic cleavage of bromine molecule is due to the presence of heat.
The initiation step:
Propagation (1)
Propagation (2)
Termination
The given base is tertiary butoxide, which is a strong base in nature, and follows the E2 elimination reaction path way with the obtained brominated product of the given substrate.
The overall reaction is as follows:
The overall reaction is as follows:
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Provide the major product expected for the following reactions. Omit byproducts. Ignore stereochemistry. Hint: if more...
Provide the major product expected for the following reactions. Omit byproducts. Ignore stereochemistry. Provide the major...
Provide the major product expected for the following reactions.
Omit byproducts. Ignore stereochemistry.
Provide the major product expected for the following reactions. Omit byproducts. Ignore stereochemistry.
Draw the major organic product of the reaction. Show the stereochemistry, if applicable. Omit byproducts such as wate...
Draw the major organic product of the reaction. Show the
stereochemistry, if applicable. Omit byproducts such as water or
bromide ion.
Draw the major organic products of the reaction. (Hint: might there be more than one product?...
Draw the major organic products of the reaction. (Hint: might there be more than one product? Will it be only substitution, only elimination, or some of each?) Indicate the stereochemistry, including H's, at each stereocenter. Omit byproducts such as salts or methanol. If there is more than one alkene that can form, only draw one of them, the one that forms to greater extent. CH3ONa CH3OH 1111
Draw the major organic product of each reaction. Indicate the stereochemistry at the stereogenic center. Omit...
Draw the major organic product of each reaction. Indicate the stereochemistry at the stereogenic center. Omit byproducts such as salts. If applicable, expand octets to minimize formal charges. CH3S SoCl2 pyridine Step 1 hint: If the C-O bond breaks, assume inversion of configuration сна
Draw the major organic product of each reaction. Indicate the stereochemistry at the stereogenic center. Omit byproduct...
Draw the major organic product of each reaction. Indicate the
stereochemistry at the stereogenic center. Omit byproducts such as
salts. If applicable, expand octets to minimize formal charges.And Draw the major organic product(s) of the following reaction
(multiple products may be drawn in one box):
Draw the major organic product of each reaction. Indicate the stereochemistry at the stereogenic center. Omit...
Draw the major organic product of each reaction. Indicate the stereochemistry at the stereogenic center. Omit byproducts such as salts. If applicable, expand octets to minimize formal charges.
Draw the major organic product of each reaction. Indicate the stereochemistry at the stereogenic center. Omit byprodu...
Draw the major organic product of each reaction. Indicate the
stereochemistry at the stereogenic center. Omit byproducts such as
salts. If applicable, expand octets to minimize formal charges.
Draw the structures of the expected organic product(s) formed in the following reactions including correct stereochemistry....
Draw the structures of the expected organic product(s) formed in the following reactions including correct stereochemistry. If more than one product is possible draw all products and write major or minor product where necessary. Indicate what the mechanism of the reaction is. Assume all reagents listed are present in excess unless otherwise noted. If no reaction occurs, state 'No Reaction'. DMF = dimethyl if ormamide, CH_3 CN = acetonitrile
plete the following reactions, providing the proper stereochemistry where required. If more than one product is...
plete the following reactions, providing the proper stereochemistry where required. If more than one product is possible, indicate the major product. a) ros. Br CH3 -CH; 1) BH THE 2) H20. NaOH -CH₂ ROOR RCO,H t.tt 1T 1) Hg(OA), H2O 2) NaBH 1. Provide the IUPAC name for the following molecule: 2. Draw the structure of Z-4-Bromo-5-methyl-4-hepten-2-yne: 3. Write down the major product(s), or the other reactant(s), of the following rea stereochemistry (wedge-and-dash) where appropriate: Xs HBr
Draw the major product(s) of the following reactions including stereochemistry when it is appropriate. CH3CH2-CEC-CH3 +...
Draw the major product(s) of the following reactions including stereochemistry when it is appropriate. CH3CH2-CEC-CH3 + 1 Brz • Consider E/Z stereochemistry of alkenes. • If there is more than one major product possible, draw all of them. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate multiple products using the + sign from the drop-down menu. ChemDoodle Previous Next
Provide the major product expected for the following reactions.
Omit byproducts. Ignore stereochemistry.
Provide the major product expected for the following reactions. Omit byproducts. Ignore stereochemistry.
Draw the major organic product of the reaction. Show the
stereochemistry, if applicable. Omit byproducts such as water or
bromide ion.
Draw the major organic products of the reaction. (Hint: might there be more than one product? Will it be only substitution, only elimination, or some of each?) Indicate the stereochemistry, including H's, at each stereocenter. Omit byproducts such as salts or methanol. If there is more than one alkene that can form, only draw one of them, the one that forms to greater extent. CH3ONa CH3OH 1111
Draw the major organic product of each reaction. Indicate the stereochemistry at the stereogenic center. Omit byproducts such as salts. If applicable, expand octets to minimize formal charges. CH3S SoCl2 pyridine Step 1 hint: If the C-O bond breaks, assume inversion of configuration сна
Draw the major organic product of each reaction. Indicate the
stereochemistry at the stereogenic center. Omit byproducts such as
salts. If applicable, expand octets to minimize formal charges.And Draw the major organic product(s) of the following reaction
(multiple products may be drawn in one box):
Draw the major organic product of each reaction. Indicate the stereochemistry at the stereogenic center. Omit byproducts such as salts. If applicable, expand octets to minimize formal charges.
Draw the major organic product of each reaction. Indicate the
stereochemistry at the stereogenic center. Omit byproducts such as
salts. If applicable, expand octets to minimize formal charges.
Draw the structures of the expected organic product(s) formed in the following reactions including correct stereochemistry. If more than one product is possible draw all products and write major or minor product where necessary. Indicate what the mechanism of the reaction is. Assume all reagents listed are present in excess unless otherwise noted. If no reaction occurs, state 'No Reaction'. DMF = dimethyl if ormamide, CH_3 CN = acetonitrile
plete the following reactions, providing the proper stereochemistry where required. If more than one product is possible, indicate the major product. a) ros. Br CH3 -CH; 1) BH THE 2) H20. NaOH -CH₂ ROOR RCO,H t.tt 1T 1) Hg(OA), H2O 2) NaBH 1. Provide the IUPAC name for the following molecule: 2. Draw the structure of Z-4-Bromo-5-methyl-4-hepten-2-yne: 3. Write down the major product(s), or the other reactant(s), of the following rea stereochemistry (wedge-and-dash) where appropriate: Xs HBr
Draw the major product(s) of the following reactions including stereochemistry when it is appropriate. CH3CH2-CEC-CH3 + 1 Brz • Consider E/Z stereochemistry of alkenes. • If there is more than one major product possible, draw all of them. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate multiple products using the + sign from the drop-down menu. ChemDoodle Previous Next
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