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Ch.8 - Reactions of Alkenes
Wade - Organic Chemistry 9th Edition
Wade9th EditionOrganic ChemistryISBN: 9780135213728Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoWade 9th EditionCh.8 - Reactions of AlkenesProblema 65a,b
Capitolo 8, Problema 65a,b

The two butenedioic acids are called fumaric acid (trans) and maleic acid (cis). 2,3-Dihydroxybutanedioic acid is called tartaric acid.
Structural formulas of fumaric acid, maleic acid, and tartaric acid, illustrating their chemical structures and relationships.
Show how you would convert
a. fumaric acid to (±)-tartaric acid.
b. fumaric acid to meso-tartaric acid.

Guida verificata passo dopo passo
1
Step 1: Recognize the structural difference between fumaric acid (trans-butenedioic acid) and tartaric acid. Fumaric acid has a double bond between the two central carbons, while tartaric acid has hydroxyl (-OH) groups attached to these carbons, making it a dihydroxy derivative.
Step 2: To convert fumaric acid to (+/-)-tartaric acid, perform a hydroxylation reaction. Use a reagent such as potassium permanganate (KMnO₄) or osmium tetroxide (OsO₄) in the presence of water. These reagents add hydroxyl groups across the double bond in a syn addition manner, resulting in a racemic mixture of tartaric acid.
Step 3: To convert fumaric acid to meso-tartaric acid, use a similar hydroxylation reaction but ensure the reaction conditions favor the formation of the meso compound. The meso form arises due to the symmetrical addition of hydroxyl groups across the double bond, leading to a molecule with internal symmetry.
Step 4: Understand the stereochemistry involved. The racemic tartaric acid contains both enantiomers (R,R and S,S configurations), while meso-tartaric acid is achiral due to its plane of symmetry.
Step 5: Verify the product by analyzing the stereochemistry and symmetry of the resulting tartaric acid. The meso-tartaric acid will have identical groups on both sides of the molecule, while the racemic tartaric acid will consist of two non-superimposable mirror images.

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Geometric Isomerism

Geometric isomerism occurs due to the restricted rotation around double bonds, leading to different spatial arrangements of atoms. In the case of fumaric acid (trans) and maleic acid (cis), the positioning of the carboxylic acid groups relative to the double bond defines their distinct properties and reactivity. Understanding this concept is crucial for predicting the outcomes of reactions involving these isomers.
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Stereochemistry

Stereochemistry is the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. Tartaric acid, which can exist in multiple stereoisomeric forms, including meso and enantiomers, exemplifies the importance of stereochemistry in organic reactions. Recognizing the stereochemical configurations is essential for converting fumaric acid to the desired tartaric acid forms.
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Reactions of Alkenes

The conversion of fumaric acid to tartaric acid involves reactions typical of alkenes, such as hydration or oxidation. These reactions can introduce functional groups or change the configuration of the molecule. Familiarity with the mechanisms of these reactions, including the addition of water across the double bond, is vital for successfully synthesizing tartaric acid from fumaric acid.
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Show how you would convert

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