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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- envellum.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. C29. 30. Which of the following classes of organic compounds does not contain oxygen? a. aldehydes b. amines c. amino acids The sequence of reactions shown here is best described as which of the following? H₂C=CH₂ CH₂CH₂OH d. ethers e. amides 1. * CH3CH3- 2. →→CH₂CH₂Br 3. a. (1) Dehydration; (2)substitution; (3) hydrogenation b. (1) Hydrogenation; (2) dehydration; (3) substitution c. (1) Hydrogenation; (2) substitution; (3) dehydration d. (1) Substitution; (2) hydrogenation; (3) dehydration e. (1) Dehydration; (2) hydrogenation; (3) substitutionThe 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. 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.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 °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.
- 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 R2propanal 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…
- Which of the following compounds will show optical activity Select one: • A. meso-tartaric acid• B. (+)-lactic acid• C. D-glyceraldehyde• D. glycerolCompounds with polyfunctional groups must follow priority rule. Which of the following compound is correctly named. Justify your claim and construct its correct structure. Compound A: 3-amino-7-carboxy-4-oxoheptanamide Compound B: 3-amino-7-carbamoyl-4-oxoheptanoic acid Compound C: 3-amino-4-ox0-7-carbamoylheptanoic acid Compound D: 3-amino-4-oxo-7-carboxyheptanamideNylon 6 is a polyamide used in the manufacture of ropes. It can be prepared via hydrolysis of e-caprolactam to form e-aminocaproic acid followed by acid-catalyzed polymerization. & e-caprafactare 27.16a Hyd aminocaproic acid Identify the structure of Nylon 6. Nylon