Concept explainers
(a)
Interpretation:
Possible mechanism for the given reaction has to be proposed.
Concept Introduction:
Reaction of an ester with ammonia or an
Treatment of an ester with ammonia or a primary or secondary amine gives an amide.
The nucleophilic addition of the ammonia or amine to the carbonyl carbon occurs followed by a proton transfer and a tetrahedral addition intermediate is formed. The intermediate can directly alkoxide and lose a proton to the alkoxide to give products.
(b)
Interpretation:
More acidic has to be identified in the given barbital molecule and the acidity of this molecule has to be accounted.
Concept Introduction:
Where,
If we know which proton is the more acidic and which proton is the less acidic we can make the determination regarding basicity.
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Chapter 18 Solutions
EP ORGANIC CHEMISTRY-OWL V2 ACCESS
- Following is a synthesis for toremifene, a nonsteroidal estrogen antagonist whose structure is closely related to that of tamoxifen. (a) This synthesis makes use of two blocking groups, the benzyl (Bn) group and the tetrahydropyranyl (THP) group. Draw a structural formula of each group and describe the experimental conditions under which it is attached and removed. (b) Discuss the chemical logic behind the use of each blocking group in this synthesis. (c) Propose a mechanism for the conversion of D to E. (d) Propose a mechanism for the conversion of F to toremifene. (e) Is toremifene chiral? If so, which of the possible stereoisomers are formed in this synthesis?arrow_forwardIn the mid-1930s a substance was isolated from a fungus that is a parasite of ryes and other grasses. This alkaloid, lysergic acid, has been of great interest to chemists because of its strange, dramatic action on the human mind. Many derivatives of lysergic acid are known, some with medicinal applications. Perhaps the best known derivative of lysergic acid is the potent hallucinogen lysergic acid diethylamide (LSD): మగవా జి N-H LSD (CH25N;O) Like other alkaloids, LSD is a weak base, with Kp = 7.6 × 107. What is the pH of a 0.94 M solution of LSD? pH =arrow_forwardShow how you might utilize the reduction of an amide, oxime, or a nitrile to carry out each of the following transformations (a)Benzoic acid to N-ethyl-N-benzylamine (b)1-Bromopentane to hexylamine (c)Propanoic acid to tripropylamine (d)2-Butanone to sec-butylaminearrow_forward
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