Organic Chemistry

Problems 781 Fill in the boxes: a. b. Give the products of each of the following reactions: a. f. b. g. c. h. d. i. e. j. T ...

782 CHAPTER 18 Carbonyl Compounds II Propose a mechanism for each of the following reactions: a. c. b. How many signals would ...

Problems 783 A compound gives the following IR spectrum. Upon reaction with sodium borohydride followed by acidification, the p ...

784 CHAPTER 18 Carbonyl Compounds II Propose a reasonable mechanism for each of the following reactions: a. b. a. In aqueous ...

Problems 785 What carbonyl compound and what phosphonium ylide are needed to synthesize the following compounds? a. b. c. d. ...

786 CHAPTER 18 Carbonyl Compounds II When a cyclic ketone reacts with diazomethane, the next larger cyclic ketone is formed. Th ...

Problems 787 In order to solve this problem, you must read the description of the Hammett treatment given in Chapter 17, Proble ...

acetyl-CoA 788 19 Carbonyl Compounds III Reactions at the -Carbona W hen you studied the reac- tions of carbonyl compounds in Ch ...

Section 19.1 Acidity of -Hydrogensa 789 19.1 Acidity of -Hydrogens Hydrogen and carbon have similar electronegativities, which m ...

790 CHAPTER 19 Carbonyl Compounds III Why is a hydrogen bonded to an hybridized carbon that is adjacent to a carbonyl carbon so ...

2,4-pentanedione Section 19.2 Keto–Enol Tautomerism 791 If the is betweentwo carbonyl groups, the acidity of an is even greater ...

792 CHAPTER 19 Carbonyl Compounds III For most ketones, the enol tautomer is much less stable than the keto tautomer. For exampl ...

Section 19.3 How Enols and Enolate Ions React 793 In an acidic solution, the carbonyl oxygen of the keto tautomer is protonated ...

794 CHAPTER 19 Carbonyl Compounds III When an reaction takes place under basic conditions, a base removes a proton from the and ...

Section 19.4 Halogenation of the -Carbon of Aldehydes and Ketonesa 795 PROBLEM 6 Explain why the aldehydic hydrogen (the one att ...

796 CHAPTER 19 Carbonyl Compounds III In the first step of this base-promoted reaction, hydroxide ion removes a proton from the ...

Section 19.6 a-Halogenated Carbonyl Compounds in Synthesis 797 Carl Magnus von Hell (1849–1926) was born in Germany. He studied ...

carbonyl compounds are also useful to synthetic chemists because once a bromine has been introduced into the of a carbonyl compo ...

Section 19.8 Alkylation of the -Carbon of Carbonyl Compoundsa 799 compound is converted into the enolate because hydroxide ion i ...

800 CHAPTER 19 Carbonyl Compounds III 3-D Molecule: 2-Methylcyclohexanone Two different products can be formed when the ketone i ...