The compound 2-hydroxypyridine, a derivative of pyridine, is in equilibrium with 2-pyridone. 2-Hydroxypyridine is aromatic. Does 2-pyridone have comparable aromatic character? Explain. N. H 2-Hydroxypyridine 2-Pyridone
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- What is going on from compound B to compound C? Can you please select all the options that applyBenzopyrene, naphthalene and pyrene are members of these group of aromaticcompounds: *Non-benzenoid aromatic compoundsHeterocyclic aromatic compoundsBenzenoid aromatic compoundsHeteronuclear compoundsWhat type of aromatic compound is pyridine? *Benzenoid aromatic compoundNon-benzenoid aromatic compoundHomonuclear cyclic compoundHeterocyclic aromatic compoundWhat property of aromatic rings prevent the involvement of the conjugated structure toaddition reactions? *Radical stabilizationResonance stabilityInductive effectAromatic effectBiphenyl has the following structure.(a) Is biphenyl a (fused) polynuclear aromatic hydrocarbon?(b) How many pi electrons are there in the two aromatic rings of biphenyl? How does this number compare with that for naphthalene?(c) The heat of hydrogenation for biphenyl is about 418 kJ>mol (100 kcal>mol). Calculate theresonance energy of biphenyl.(d) Compare the resonance energy of biphenyl with that of naphthalene and with that of two benzene rings. Explain thedifference in the resonance energies of naphthalene and biphenyl.
- What groups favor the nitration of benzene and what groups do not favor it?Tyramine is an alkaloid found in mistletoe and ripe cheese. Dopamine is a neurotransmitter involved in the regulation of the central nervous system. a. How can tyramine be prepared from β-phenylethylamine?b. How can dopamine be prepared from tyramine?c. Give two ways to prepare β-phenylethylamine from β-phenylethyl chloride.d. How can β-phenylethylamine be prepared from benzyl chloride?e. How can β-phenylethylamine be prepared from benzaldehyde?Consider the tetracyclic aromatic compound drawn below, with rings labeled as A, B, C, and D. (a) Which of the four rings is most reactive in electrophilic aromatic substitution? (b) Which of the four rings is least reactive in electrophilic aromatic substitution? (c) What are the major product(s) formed when this compound is treated with one equivalent of Br2?
- Amino acids such as glycine are the building blocks of large molecules called proteins that give structure to muscle, tendon, hair, and nails. a.) Explain why glycine does not actually exist in the form with all atomsuncharged, but actually exists as a salt called a zwitterion. b.) What product is formed when glycine is treated with concentratedHCl?c.) What product is formed when glycine is treated with NaOH?__________ will exist as a racemic mix. Chloro ethyl methyl amine Phenyl amine Ammonia Methyl diphenyl propyl ammonium chloride Diethyl amine Thank you!An aromatic hydrocarbon with a molecular formula of C13H20 has an 1H NMR spectrum with a signal at ~7 ppm that integrates to 5H. It also has twosinglets; one of the singlets has 1.5 times the area of the second. What is the structure of the aromatic hydrocarbon?
- Why 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?The pKa of p-methylthiophenol (CH3SC6H4OH) is 9.53. Is p-methylthiophenol more or less reactive in electrophilic aromatic substitution than phenol?The shrub ma huang (Section 5.4A) contains two biologically activestereoisomers—ephedrine and pseudoephedrine—with two stereogeniccenters as shown in the given structure. Ephedrine is one component ofa once-popular combination drug used by body builders to increaseenergy and alertness, whereas pseudoephedrine is a nasaldecongestant.a.) Draw the structure of naturally occurring (−)-ephedrine, which has the1R,2S configuration.b.) Draw the structure of naturally occurring (+)-pseudoephedrine, whichhas the 1S,2S configuration.c.) How are ephedrine and pseudoephedrine related?d.) Draw all other stereoisomers of (−)-ephedrine and (+) pseudoephedrine, and give the R,S designation for all stereogeniccenters.e.) How is each compound drawn in part (d) related to (−)-ephedrine?