The amino acid (S)-alanine has the physical characteristics listed under the structure. a. What is the melting point of (R)-alanine? b. How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine? c. What is the specific rotation of (R)-alanine, recorded under the same conditions as the reported rotation of (S)-alanine?

The amino acid (S)-alanine has the physical characteristics listed under the structure. a. What is the melting point of (R)-alanine? b. How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine? c. What is the specific rotation of (R)-alanine, recorded under the same conditions as the reported rotation of (S)-alanine?

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter23: Amines

Section23.5: Basicity

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The amino acid (S)-alanine has the physical characteristics listed under the structure. ÇOOH a. What is the melting point of (R)-alanine? b. How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine? c. What is the specific rotation of (A)-alanine, recorded under the same conditions as the reported rotation of (S)-alanine? d. What is the optical rotation of a racemic mixture of (R)- and (S)-alanine? e. Label each of the following as optically active or inactive: a solution of pure (S)-alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains 75% (S)- and 25% (R)-alanine. CH NH2 (S)-alanine [a) = +8.5 mp = 297 °C
The amino acid (S)-alanine has the physical characteristics listed under the structure. How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine?
The amino acid (S)-alanine has the physical characteristics listed under the structure. a.What is the melting point of (R)-alanine? b.How does the melting point of a racemic mixture of (R)- and (S)-alanine compare to the melting point of (S)-alanine? c. What is the specific rotation of (R)-alanine, recorded under the same conditions as the reported rotation of (S)-alanine? d.What is the optical rotation of a racemic mixture of (R)- and (S)-alanine? e.Label each of the following as optically active or inactive: a solution of pure (S)alanine; an equal mixture of (R)- and (S)-alanine; a solution that contains 75% (S)- and 25% (R)-alanine.
In the structures of T—A and C—G base pairs, there are three amino groups specifically labeled as “sp2 hybridized and planar”. What is the primary difference between these structures and that of aniline that lead to their planarity? 1. In contrast to aniline, the amino groups on the DNA bases are necessary to make the heterocyclic rings aromatic. 2. In contrast to aniline, the contributing structures that delocalize the nitrogen lone pairs onto the rings creates partial negative charges on electronegative atoms. 3. In contrast to aniline, the hydrogen bond accepting ability of the lone pairs on the -NH2 groups of the DNA bases is better when these amino groups are sp2 hybridized. 4. Both 2 and 3.
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Consider alanine a. How many chiral centers? b. How many stereoisomers? c. Draw the fischer projection for each stereoisomer and determine the absolute configuration for each chiral center.
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C. Trehalose and isomaltose are both dimers of glucose. However, they have considerably different reactivities. Concisely explain why these differences are observed. OH HO но но. HO HO OH Но- он но OH HO НО trehalose isomaltose 1. Isomaltose is a reducing sugar while trehalose is not. 2. Trehalose is very resistant to acid hydrolysis while isomaltose can be acid-hydrolyzed with ease.
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3. The molecule to the right is: A. Cys-His with a trans peptide bond B. Cys-Pro with a trans peptide bond C. Pro-Cys with a trans peptide bond D. Pro-Cys with a cis peptide bond E. Cys-Pro with a cis peptide bond H₂N SH -COOH