Which of the following is true of the Fischer esterification reaction? However, in the presence of strong base, the enol equilibrium is unaffected, but the amount of enolate increases. A) A Ans: B B) B C) C D) D 47. A) cyclohexanone C) 3,3-dimethylcyclohexanone B) 2,2-dimethylcyclohexanone D) 4,4-dimethylcyclohexanone Ans: C 5. my review here
Identify the keto form of the following enol. cat. q The pi bond of an alkene is already nucleophilic, but that of an enol becomes even more electron-rich because of the carbanion character generated at the beta carbon. A Page 297 Chapter 18 Carboxylic Acids 33.
More questions Enolate anion reaction? Which one of the following cannot give a Claisen condensation product? The Equilibrium between Ketone and Enolate in Aqueous Base: How to calculate the position of the equilibrium using a qualitative criterion and a quantitative criterion; Quantitative generation of the enolate.(Important) Further, Which one of the following does not react with benzoyl chloride, C6H5COCl?
Only then is the carbonyl component added. Which of the following is the conjugate base of ethyl butanoate? The anion formed in this case is an enolate anion which is highly resonance stabilized, as shown above. When the keto ester shown is treated with NaOCH3, how many singly-charged resonance structures can be drawn for the product?
Please try the request again. These two opposing factors tend to cancel, making both structures nearly equal in energy. C N 1. Identify the keto form of the following enol.
What is the product of the following reaction sequence? A) 2,3-dimethyl-1-pentanol B) 3,3-dimethyl-1-pentanol Ans: D C) D) 3-ethyl-2-methyl-1-hexanol 2-ethyl-3-methyl-1-hexanol 26. Identify the most acid hydrogen for the following compound. Relative Amounts of Enolate and Enol.
cyclohexanone b. 2,2-dimethylcyclohexanone *c. 3,3-dimethylcyclohexanone d. 4,4-dimethylcyclohexanone 5. Identify the most acidic hydrogen in the following compound. The alkyl halide used will lead to elimination rather than alkylation. What product(s) would you expect from the following reaction?
The rate is not only independent of the concentration of the halogen but also of the nature of the halogen. this page As it is freezing and snowing, cannot afford heating bills? In contrast, the isomeric enol is reactive toward electrophiles at carbon. only II C.
View Full Document 6. q Why is this proton so acidic, when C-H bond protons of alkanes typically have pKa's of 50? What product(s) result(s)? get redirected here A) 4-methyl-3-hexanone B) 4-heptanone Ans: B C) D) Page 334 2-propylbutanoic acid 2-ethylpentanoic acid Chapter 20 Enols and Enolates 48.
Recall that anion stability is usually the controlling factor in determining relative acidities. So bromine reacts much more rapidly than does hydronium ion with the intermediate enol. Arrange the following compounds in order of decreasing acidity.
A) 3 B) 4 Chapter 20 Enols and Enolates.pdf 15 pages a multiple Claisen reaction b differential Claisen reaction c crossed Claisen SMU CHEM 3372 - Spring 2014 1. (1.0 point) Which line below correctly describes the major organic species in the two resulting immiscible solutions? q The mechanism of the reaction is the same as for the standard Claisen condensation and is shown below: q This works efficiently because the enolate, once formed, reacts Identify the two compounds which give this condensation product.
four 16. B) propanoic acid and CH3Cl. q Recall that the rules of resonance specify that large resonance stabilizations result when there are 2 or more structures of equal energy. http://bovbjerg.net/which-of/what-material-phases-cannot-form-a-solution.php A) A Ans: C B) B C) C D) D 34.
Sign up to view the full document. THE CROSSED ALDOL REACTION. What is the general name for the reaction product formed in an aldol addition reac 24key 27 pages B pentanoic acid D 2 hexenoic acid Ans A 56 Which one of II > III > I c.
A) A Ans: D B) B C) C D) D 7. Which one of the following optically active compounds racemizes in dilute KOH/CH3OH solution? D 14. Identify the lactone formed by the following hydroxy carboxylic acid.
Note also that carbonyl compounds without alpha hydrogens do not react with bromine at all. Chem help?