At what position, and on what ring, is bromination of phenyl benzoate expected most likely to occur? B oto A Ortho on ring A Ortho on ring B Para on ring A Para on ring B
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- Provide the curved arrow formalins for tbe reaction of (R)-3-chloro-2-methyl-1-propanol treated with phosphorus tribromide. I appreciate the help!Which alkene on ozonolysis produce Pentan-3-one and 2-Methylpropanal?Acetoxybenzene (PhOC(=O)OCH3) is much less reactive than ethoxybenzene (PhOCH2CH3) in electrophilic aromatic substitution reactions. Suggest an explanation for this result, based on an analysis of the inductive and resonance electronic effects of the two substituents on the stability of theWheland intermediate for para substitution by an electrophile E+
- Please deaw structures of the resonance structures of "enolate" of the following compounds with "a-H's" . Each has more than one kind, so choose the a-H marked (*). Thank you!The following reactions are unlikely to provide the indicated product in high yield. What is wrong with each?When a 2, 6-disubstituted allyl phenyl ether is heated in an attempted Claisen rearrangement, migration occurs to give the p-allyl product as the result of two sequential pericyclic reactions. Explain.
- Why do you suppose ketone halogenations in acidic media are referred to as being acid-catalyzed, whereas halogenations in basic media are base-promoted? In other words, why is a full equivalent of base required for halogenation?There are two isomeric cyclohexa-1,4-diene products when benzoic acid undergoes the Birch reduction (see Problem 25.24). (a) Draw the mechanism that leads tothe formation of the major product. (b) Will the Birchreduction of benzoic acid occur faster or slower than theBirch reduction of benzene itself? Hint: Is –CO2H anelectron-donating or an electron-withdrawing group?Explain how and why rearrangements occurduring Friedel-Crafts alkylation reactions formingmore than 1 product. Also illustrate therearrangement reaction from the aboveexample.
- The reaction of cyclohexene with iodobenzene under Heck conditions forms E, a coupling product with the new phenyl group on the allylic carbon, but none of the “expected” coupling product F with the phenyl group bonded directly to the carbon–carbon double bond. Draw a stepwise mechanism that illustrates how E is formed.What i sthe major product of the reduction of the following compund with LiAlH4? The correct answer is C, but please explain why.Provide the mechansim using curved arrows of the reaction of p-t-butyl phenol treated with acetic anhydride in AlCl3. Include resonance stabilized intermediates and if more than one product is formed, label them as major, minor, etc. thank you for the help