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(a)
Interpretation:
The pericyclic selection rules have to say about the position of equilibrium in each of the reactions given in Fig. P28.30.The side of each equilibrium is favored. These statements are to be described.
Concept introduction:
Pericyclic reactions deal with electrons shift in a concerted manner. Moreover, in these reactions the breaking of reactant bonds and the formation of product bonds are formed at the same time.i.e., without the formation of intermediates. The word ‘pericyclic’ means around the cycle. Notably, the pericyclic reactions are classified as electrocyclic, cycloaddition and sigmatropic reactions based on the activation of reaction, the number of electrons involved and the stereochemistry outcome of the reactions. The selection rules of pericyclic reaction deal mostly on the
(b)
Interpretation:
The position of equilibrium is to be described.
Concept introduction:
Generally, the pericyclic reactions are classified as electrocyclic, cycloaddition and sigmatropic reactions based on the activation of reaction, the number of electrons involved and the stereochemistry outcome of the reactions. The selection rules of pericyclic reaction deal mostly on the rates of reaction and does not tell anything about position of equilibrium and equilibrium constant values.
(c)
Interpretation:
The position of equilibrium is to be described.
Concept introduction:
Generally, the pericyclic reactions are classified as electrocyclic, cycloaddition and sigmatropic reactions based on the activation of reaction, the number of electrons involved and the stereochemistry outcome of the reactions. The selection rules of pericyclic reaction deal mostly on the rates of reaction and does not tell anything about position of equilibrium and equilibrium constant values.
(d)
Interpretation:
The position of equilibrium is to be described.
Concept introduction:
Generally, the pericyclic reactions are classified as electrocyclic, cycloaddition and sigmatropic reactions based on the activation of reaction, the number of electrons involved and the stereochemistry outcome of the reactions. The selection rules of pericyclic reaction deal mostly on the rates of reaction and does not tell anything about position of equilibrium and equilibrium constant values.
(e)
Interpretation:
The position of equilibrium is to be described.
Concept introduction:
Generally, the pericyclic reactions are classified as electrocyclic, cycloaddition and sigmatropic reactions based on the activation of reaction, the number of electrons involved and the stereochemistry outcome of the reactions. The selection rules of pericyclic reaction deal mostly on the rates of reaction and does not tell anything about position of equilibrium and equilibrium constant values.
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Chapter 28 Solutions
Organic Chemistry
- A- What is the definition of acidity? B- Compare the acidity of ammonia and its aliphatic derivatives with of acidity pyrrole C- Melting points of pyrrole is higher than melting point of 1-methyl pyrrole explain your answer D- Why does pyrrole prefer electrophilic substitution reactions? E- Why Pyrrole is considered to be an aromatic compound ? F- Explain the Reimer-Tiemann reaction mechanism of heterocyclic compounds? G- Why pyridine is a weak base? explain your answer? H- Pyridine can react with electrophiles, electrophilic substitution ? explain your answer ? G- Explain the Diels–Alder reaction mechanism of heterocyclic compounds? I- From a-haloketone how can you prepared flowing compounds : Imidazole Oxazole Thiazole J- compared the acidity and basicity of Pyrazole and Imidazole with Pyrrole and Pyridine ?arrow_forwardWhich of the following compounds (A or M) would be the better choice for a nucleophilic substitution reactionusing Compound T as the starting material and DMSO as the solvent? Would the resulting reaction be SN1 or SN2?arrow_forwardArrange the compounds in set in order of decreasing reactivity (fastest to slowest) toward electrophilic aromatic substitution.arrow_forward
- Rationalize the selectivity observed in the benzil reduction. Draw the transition states of the nucleophilic attack leading to either meso or racemic products and indicate why one is more stable than the other.arrow_forwardGive the structures of A, B, and C in the following Wittig reaction sequence.arrow_forwardCompare Electrophilic aromatic substitution reactivity to quinoline and isoquinoline. Please, explain with diagramsarrow_forward
- Identify the pericyclic reactions in the following reaction schemes. Give the complete reaction name and indicate the course of the reaction with the aid of the arrow notation.arrow_forwardDraw the arrow pushing mechanism for the reaction of camphor to isoborneol. For each step on the mechanism give one DETAILED sentence on what is occurring and why. Examples: "Loss of water to form a tertiary carbocation", "nucleophilic attack of ____ to increase acidity of ____", "methyl shift of ____ to form ____", etc. Thank you!arrow_forwardCompound F may be synthesised by the method attached Draw the isomer of compound B and explain which one would be the major product and why.arrow_forward
- Which of the following is statements is/are TRUE about the experiment on the relative rates of electrophilic aromatic substitution?I. The experiment must be performed in dark conditions. II. Using the same solvents, a faster decolorization will be observed in aniline as compared to ethylbenzene. III. Chlorobenzene will react faster than methoxybenzene. IV. The use of AlCl3 in the halogenation of aromatic compounds using elemental bromine could hasten the reaction.arrow_forwardWhat is the difference of SN1 and SN2 reactionarrow_forwardWhy does the carbomethoxy group directs the reaction to positions that are meta to it ?b) Why the formation of dinitrobenzaote is substantially disfavored ?c) Would you expect small amounts of the ortho and para substituted product ? How would you remove them if they are formed ?d) Why does water have a retarding effect on the nitration ?e) Explain why Benzene has lower reactivity in electrophilic addition reactions than cyclohexene?arrow_forward
Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning