2. In the synthesis of peptides, carboxylic acids are condensed with amines in the present of a reagent such as dicyclohexylcarbodiimide (DCC) [Section 25.6]. a. Propose a mechanism for the following, using curved arrow notation. H₂N. Мон glycine H₂N. + OH Дон DCC H₂N. .OH OH H glycine gly-gly 1. Propose a detailed stepwise mechanism, using curved arrow notation, for the following. a. H+ N H2O, heat H b. N H 1. LiAlH4 (xs) 2. H₂O H OH Η + H
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- 2. In the synthesis of peptides, carboxylic acids are condensed with amines in the present of a reagent such as dicyclohexylcarbodiimide (DCC) [Section 25.6]. a. Propose a mechanism for the following, using curved arrow notation. H₂N. glycine OH H₂N 요. glycine OH DCC H₂N. N H gly-gly LOHThe 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 °Ctert-Butoxycarbonyl azide was developed as a reagent for peptide synthesis at OWL's home institution, the University of Massachusetts, by Prof. L.A. Carpino. It is prepared by treating tert-butoxycarbonyl chloride with sodium azide. Propose a structure for the initially-formed intermediate in this reaction.
- 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.E. E 4. Which chemical bond labeled in the structure below is called a peptide bond A. A; B. B; C. C; B D. D; A R1 H HIN E Н NIH D H C R2envellum.ecollege.com/course.html?courseld3D16522631&OpenVellumHMAC=85a7baea4e7d7b9e1c025b928e35fe16#10001 I Review Constants | Periodic Table The compounds commonly known as "amino acids" are actually a-aminocarboxylic acids. What carbonyl compounds should be used to synthesize the two amino acids shown here using reductive amination? Part A CH3CH NH2 Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default. +) H 120 EXP. . i CONT. L. C
- 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. HO, NH2 (S)-alanine [a] = +8.5 mp = 297 °CWhich of the following compounds will show optical activity Select one: • A. meso-tartaric acid• B. (+)-lactic acid• C. D-glyceraldehyde• D. glycerolpropanal propanoic acid N-ethylpropanamide -HO- AA acidified KMN0, H;C NH2 NH CH3 H3C H3C BB H3C- DD HJ Ni он H;C propan-1-ol CC (ii) Name the type of chemical reaction for the formation of compound CC. Namakan jenis tindak balas kimia bagi penghasilan sebatian CC.
- CH,OCH,CI SnCl, CH,CI The chloromethylated polystyrene resin used for Merrifield solid-phase peptide synthesis is prepared by treatment of polystyrene with chloromethylmethyl ether and a Lewis acid catalyst. The reaction involves the following steps: 1. Reaction of the ether with the Lewis acid to form cation 1; 2. Electrophilic aromatic substitution to form resonance stzbilized cation 2: 3. Deprotonation yields aromatic ether 3: 4. Protonation to žorm protonated ether 4; 5. Displacement by chloride ion to form the final product Write out the mechanism on a separate sheet of paper and then draw the structure of the resonance contributors of the resonance stabilized cation 2. • Use Rl groups to indicate the points where the polymer repeats. The R group tool is located in the charges and lone pairs drop-down menu. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate resonance structures using the symbol from the…24. 25. Propose a synthesis for the molecule. -CH3 NEC- Propose a synthesis for the molecule. O NHCH₂CH3 ngName the following compounds as pyranose/furanose; Pyranoside/Furanoside; alfa/beta; Reducing/ non-reducing sugars