Concept explainers
(a)
Interpretation:
The
Concept introduction:
Alkene metathesis reactions are the reactions in which two alkene are broken at their double bonds and are rearranged to give the new alkene products. Grubb’s catalyst is used to catalyze the alkene metathesis reaction.
(b)
Interpretation:
The alkene metathesis reaction that would yield the given product as a major product is to be stated.
Concept introduction:
Alkene metathesis reactions are the reactions in which two alkene are broken at their double bonds and are rearranged to give the new alkene products. Grubb’s catalyst is used to catalyze the alkene metathesis reaction.
(c)
Interpretation:
The alkene metathesis reaction that would yield the given product as a major product is to be stated.
Concept introduction:
Alkene metathesis reactions are the reactions in which two alkene are broken at their double bonds and are rearranged to give the new alkene products. Grubb’s catalyst is used to catalyze the alkene metathesis reaction.
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Organic Chemistry
- (a) (b) (c) Suggest a synthesis of the following alkene (A) using a Wittig reaction strategy. Draw the starting material(s), key reagent and a full reaction mechanism including an explanation of the observed geometry. Which of the following (B) and (C) will favour the enol form? Briefly explain your reasoning. Predict the product(s) and provide a mechanism for each of the following transformations: (i) (ii) OMe OMe Base OEt NaOEtarrow_forward(a) What reagents would be used for the conversion of alkene A into the target? (b) What reaction is involved in the conversion of alcohol B into alkene A? Suggest a reagent that might affect this transformation. (c) Give a retrosynthetic analysis showing the disconnection of B, the synthons produced that lead to the synthetic equivalents given (draw their structures).arrow_forwardConsider the tetracyclic compound with rings labeled A–D. (a) Which ring is the most reactive in electrophilic aromatic substitution? (b) Which ring is the least reactive in electrophilic aromatic substitution?arrow_forward
- Give IUPAC names for the following structures. (If appropriate, specify relative stereochemistry.) (a) (b) S Sarrow_forward(a) When (Z)-3-methylhex-3-ene undergoes hydroboration–oxidation, two isomericproducts are formed. Give their structures, and label each asymmetric carbon atomas (R) or (S). What is the relationship between these isomers?(b) Repeat part (a) for (E)-3-methylhex-3-ene. What is the relationship between the productsformed from (Z)-3-methylhex-3-ene and those formed from (E)-3-methylhex-3-ene?arrow_forward2. (a) Reaction of an alkene with ozone followed by an oxidative workup gives the product shown. What is the structure of alkene A? A (b) Compounds B and C both have the formula C10H16. Hydrogenation of either compound over Pt gives the same product, cis-1-isopropyl-4-methylcyclohexane. Ozonolysis with reductive workup fragments the two compounds differently, as shown below. What are the structures of C B and C? (CHCl3, chloroform, is the solvent.) B 1) 03, CHCI 3 2) (CH3)2S 1) 03, CHC13 2) (CH3)2S H O 1) 03 2) H₂O2, H₂O H3C- H O CH3 3. (a) Draw the structures of all enols that would spontaneously form this ketone, including stereoisomers. + + I HO₂C H + La CH3CH₂-C-CH(CH3)2 O= (b) Would alkyne hydration be a good preparative method for this compound? If so, give the reaction. If not, explain why.arrow_forward
- Give reasons :(a) n-Butyl bromide has higher boiling point than f-butyl bromide.(b) Racemic mixture is optically inactive.(c) The presence of nitro group (-NO2) at o/p positions increases the reactivity of haloarenes towards nucleophilic substitution reactions.arrow_forwardUsing cyclohexane as your starting material, show how you would synthesize each of the following compounds. (Onceyou have shown how to synthesize a compound, you may use it as the starting material in any later parts of this problem.)(a) bromocyclohexane (b) cyclohexenearrow_forwardDraw a structural formula for the alcohol formed by treating each alkene with borane in tetrahydrofuran (THF) followed by hydrogen peroxide in aqueous sodium hydroxide, and specify stereochemistry where appropriate. (a) (d) (b) (e) (c)arrow_forward
- Show how you would convert hex-1-ene to each of the following compounds. You may use any additional reagents andsolvents you need.( (b) 1-methoxyhexanearrow_forward(a) What is the major alkene formed when A is dehydrated with HS2O4? (b) What is the major alkene formed when A is treated with POCl3 and pyridine? Explain why the major product is different in these reactions.arrow_forward1. (a) (b) Provide necessary reagents to obtain the desired product. من السابعة مة السامية لسامة (c) 2. میل 1. 2. 3.arrow_forward
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