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- Rank the attached dienophiles in order of increasing reactivity.With the use of resonance structures, explain why OH group of phenol is an ortho/para director. Provide illustration as needed and explain in depth (5 sentences min.)On a large scale (such as a chemical plant) is it better for the Grignard reagent to attack a hindered carbon or an unhindered carbon? And why?
- Can you explain how they got the minor product, show the movement of electrons etc.Based on Steric Effect and Electron Delocalization Explain: 1. Phenol is not easily attacked by a positive reagent as aniline 2. Solubility of acetylinic compound in may bases Please do answer all question for an upvote!! Thank you!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 ?
- Draw a stepwise mechanism for the following Robinson annulation. This reaction was a key step in a synthesis of the steroid cortisone by R. B. Woodward and co-workers at Harvard University in 1951.Rank the attached compounds in order of increasing reactivity in asubstitution reaction with −CN as nucleophile.Study the following reaction sequence and draw the structures for compounds A – F.