Explain why enol tautomerism is NOT possible when there is no alpha hydrogen present.
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Explain why enol tautomerism is NOT possible when there is no alpha hydrogen present.
10.74 The following compounds exhibit tautomerism, with a particu- ly high enol concentration. Compound 1 exhibits an enol concen- tration for (CH3)2CHCHO. Compound 2 exhibits an enol concentration of 95% (Acc. Chem. Res. 1988, 21, 442-449): of 9.1%, as compared with the enol concentration of 0.014% 2 (a) Draw the enol of compound 1 and offer an explanation for the high enol concentration, relative to (CH3)2CHCHO b) Draw the enol of compound 2, and explain why the enol is favored...
19. Which of the following can undergo keto-enol tautomerism? a. 2,4-dimethyl-3-pentanoneb. 2.2.4,4-tetramethyl-3-pentanone c, both a and b d. neither a norb 20. Which of the following compounds is a tautomer of the following compound? MOH OH OH c. both a and b d. neither a norb 21. Examine the following ball-and-stick models. Atoms other than carbon and hydrogen are labeled with the symbol of the element. How is this reaction classified? a. oxidation b. reduction c. tautormerization d. hemiacetal formation...
4. Which tautomer of phenol is favored and why? A. enol, better hydrogen bonding C. keto, better CO resonance B. enol, aromaticity D. 1:1 both keto and enol forms are favored 5. Which base will completely and irreversibly form the enolate of the compound shown?: ? A. KOH B. NaOH C. NHS D. NaNH2
1. a) Draw the structure of an enol of this compound. If no enol is possible, write "none possible". b) How many acidic hydrogens (pka <22) does this compound have? c) Can this compound react with I/KOH in the haloform reaction? If so, give the products. If not, state why not. 2. Show how you would make this compound by a malonic ester synthesis or an acetoacetic acid synthesis. hexanoic acid 3. Write in the products of these reactions: NaOCH2CH3...
1. why is the cannizzaro reaction limited to aldehydes having no alpha hydrogen atoms? 2. why do ketones having no alpha hydrogen atoms not undergo the Cannizzaro reaction?
Provide a brief statement to explain why the following
equilibrium favors the enol tautomer. Please further explain the
corrected answer written in red.
12) Provide a brief statement to explain why the following equilibrium favors the enol tautomer. OH ccouse it has mere Stap:Aky dve れ) (esonance romatic Slabi hat
12) Provide a brief statement to explain why the following equilibrium favors the enol tautomer. OH ccouse it has mere Stap:Aky dve れ) (esonance romatic Slabi hat
In C, which alpha hydrogen would get removed and why?
is 4p1 a possible electron configuration for hydrogen? explain
explain the hydrogen bonding pattern for B sheet ( parallel and antiparallel, alpha helix and B turn in terms of (I+N).
3. Circle the hydrogen-bond donors and acceptors present in the following molecule. Draw the possible hydrogen bonding with two molecules of A. HO OH A 4. What is the strongest intermolecular attractive force between compound A and compound B? Use the structures of A and B to show the intermolecular forces between them. CH3 B A