Amino acid residues in a dipeptide from aspartame should be identified, name of the dipeptide, three-letters and one-letter abbreviations for the dipeptide should be determined. Concept introduction: ► Two amino acid molecules join together to form a peptide bond with the release of a water molecule. The part of amino acid that remains in the peptide is called the amino acid residue. ► Dipeptides are the peptides that contain two amino acid residues. ► Each dipeptide is named after the names of amino acid residues using three-letters and one letter abbreviations. To determine: Amino acid residues in the dipeptide, names of the dipeptide using three-letters and one-letter abbreviations.

Question

The Concept of Aromaticity 21.15 State the number of 2p orbital electrons in each molecule or ion. (a) (b) (e) (f) (c) (d) (h) (i) DA (k) 21.16 Which of the molecules and ions given in Problem 21.15 are aromatic according to the Hückel criteria? Which, if planar, would be antiaromatic? 21.17 Which of the following structures are considered aromatic according to the Hückel criteria? ---0-0 (a) (b) (c) (d) (e) (h) H -H .8.0- 21.18 Which of the molecules and ions from Problem 21.17 have electrons donated by a heteroatom?

Answer 1

Question

Chapter 19, Problem 19.77AQAP

Interpretation Introduction

Interpretation:

Amino acid residues in a dipeptide from aspartame should be identified, name of the dipeptide, three-letters and one-letter abbreviations for the dipeptide should be determined.

Concept introduction:

► Two amino acid molecules join together to form a peptide bond with the release of a water molecule. The part of amino acid that remains in the peptide is called the amino acid residue.

► Dipeptides are the peptides that contain two amino acid residues.

► Each dipeptide is named after the names of amino acid residues using three-letters and one letter abbreviations.

To determine: Amino acid residues in the dipeptide, names of the dipeptide using three-letters and one-letter abbreviations.

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The Concept of Aromaticity 21.15 State the number of 2p orbital electrons in each molecule or ion. (a) (b) (e) (f) (c) (d) (h) (i) DA (k) 21.16 Which of the molecules and ions given in Problem 21.15 are aromatic according to the Hückel criteria? Which, if planar, would be antiaromatic? 21.17 Which of the following structures are considered aromatic according to the Hückel criteria? ---0-0 (a) (b) (c) (d) (e) (h) H -H .8.0- 21.18 Which of the molecules and ions from Problem 21.17 have electrons donated by a heteroatom?

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