(a)
Interpretation: If the reaction is proceeding under thermal conditions then the ring closure of the given compound
Concept introduction:
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Electrocyclic reactions are listed below
(b)
Interpretation: The configuration of product has to be predicted.
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Electrocyclic reactions are listed below
Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,
(c)
Interpretation: If the reaction is proceeding under photochemical conditions then the ring closure of the given compound
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Electrocyclic reactions are listed below
(d)
Interpretation: The configuration of the product has to be predicted.
Concept introduction:
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Electrocyclic reactions are listed below
Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,
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Chapter 28 Solutions
Organic Chemistry - Access
- How many possible monoborminated products including stereoisomers would you expect for the reaction of 2,3-dimethylpentane with Br2 in the presence of light? (4,6,5,7)?arrow_forwardWhat is the stereochemical outcome of the oxidation of cis-1,2-dimethylcyclohexene,with KMnO4arrow_forwardExclusive of stereoisomers, how many products are possible in the electrophilic addition of 1 mol of bromine to 2-methyl-1,3-butadiene?arrow_forward
- What is the product(s) of the reaction, clearly identifying stereochemistry of the product(s)? Assisting the drawing with writing R or S, racemic, cis or trans may help. If there is no reaction, write N.R.arrow_forwardwhich of the following general statements is true about the addition of HBr to conjugated dienes (A) At low temperature, the 1,2-adduct predominates (B) At low temperature, the 1,4-adduct predominates (C) At high temperature, the 1,2-adduct predominates (D) Temperature does not affect the outcome of the reactionarrow_forwardIn the reaction below, 3-Buten-2-one reacts with 2,3-Dimethyl-1,3-butadieneand 1,3-Butadieneat 140°C and 30°C, respectively. Explain why these two dienes react at different temperatures.arrow_forward
- 1)Chemistry students are taking an experimental course in organic chemistry at a public university. During an experiment involving conjugated dienes, some doubts arose when discussing the results obtained so far: (a) A student obtained two products from the reaction of 1,3-cyclohexadiene with Br2. His lab partner was surprised to get only one product from the reaction of 1,3 - cyclohexadiene with HBr. Explain these distinct results. (b) One student, seeing the discussion of colleagues, commented that she obtained two distinct products when reacting 1,3,5-hexatriene with HBr, with different yields just by changing the reaction temperature. Explain the results she obtained using reaction mechanism and based on kinetic and thermodynamic control involving conjugated dienes.arrow_forwardIn parts 1 and 2 draw the two organic products of this reaction, showing any nonzero formal charges. Then, in part 3 answer the question regarding purification of the reaction mixture. 1. Draw the product with the higher molecular weight here: 2. Draw the product with the lower molecular weight here:arrow_forwardWhen Br2 is added to buta-1,3-diene at -15 °C, the product mixture contains 60% ofproduct A and 40% of product B. When the same reaction takes place at 60 °C, theproduct ratio is 10% A and 90% B.If you had a solution of pure A, and its temperature were raised to 60 °C, what wouldyou expect to happen? Propose a mechanism to support your prediction.arrow_forward
- Assign the stereochemical configuration (E or Z) for the alkene below. Show your work, indicating clearly which groups are assigned high priority (e.g., through assigning the groups numbers, circling only the high priority groups, or labeling groups as high or low).arrow_forwardWhy is tertiary carbocation most favored for Sn1 reactions?arrow_forward1, part A) We observe 6 carbon stereocenters in the molecule below. Indicate each stereocenter, and give the absolute S or R configuration. 1, part B) Indicate each stereoisomer in this molecule, and give the absolute S or R configuration. Then, indicate E or Z configuration of all alkenes in it (*ignoring aromatic ring*).arrow_forward
Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning