(a)
Interpretation:
The primary structure of
Concept introduction:
An amide bond formed between a carboxyl group present on the side chain of an amino acid and the
(b)
Interpretation:
The reaction between two peptide chains within the pilus is to be shown. The mechanism of the corresponding reaction is to be stated.
Concept introduction:
An amide bond formed between a carboxyl group present on the side chain of an amino acid and the amine group present on the side chain of an amino acid is known as an isopeptide bond.
(c)
Interpretation:
The reason as to why the reaction between peptides
Concept introduction:
An amide bond formed between a carboxyl group present on the side chain of an amino acid and the amine group present on the side chain of an amino acid is known as an isopeptide bond.
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EBK ORGANIC CHEMISTRY STUDY GUIDE AND S
- Which fragment correlates to the base peak of the following mass spectrum? 100 80 20 10 20 30 40 50 60 70 80 90 m/z Relative Intensityarrow_forwardBased on the mass spectrum shown below, 100 73 HO 80 A 58 20 100 10 20 30 40 50 100 60 70 m/z 80 90 110 (i) identify the molecular ion peak of compound A. (ii) explain how the labelled fragments are formed. Relative Intensityarrow_forwardIdentify the fragment giving rise to the peak at m/z 43.arrow_forward
- Th emajor fragmentation of the following molecule occurs through the Mclafferty rearrangement . which of the following is expected to be the base peak in the mass spectrum? I cleaved the compound on the bonds adjacent to the alpha and calculated the mass for the biggest fragment, which was m/z= 73. The answer is actually m/z = 86. Can someone give me a step by step on how to do this problem?arrow_forwardMost common amines (RNH2) exhibit pKa values between 35 and 45. R represents the rest of the compound (generally carbon and hydrogen atoms). However, when R is a cyano group, the pKa is found to be drastically lower: H H Incorrect. 人 R N H PK = 35-45 N N H PK = = 17 (a) Explain why the presence of the cyano group so drastically impacts the pKa. ○ When R is a cyano group, the acidic proton is on an sp-hybridized atom. ○ When R is a cyano group, the conjugate base is destabilized by resonance. ○ When R is a cyano group, the conjugate base is destabilized by inductive effects. ● When R is a cyano group, the conjugate base is stabilized by resonance.arrow_forwardIndicate which structure produces the mass spectra below. Submit your answer as a single letter with no abbreviation. 45 100 MS-NW-1331 80 - 60 40 20 - 74 29 10 20 30 40 50 60 70 80 90 100 110 120 m/z (a) (b) (c) (d) (e) Answer:arrow_forward
- Draw the structure responsible for the signal at m/z 58 and name the fragmentation mechanism involvedarrow_forwardWhat is the fragment for the base peak at m/z = 29? Deduce and explain the halogen present in the compound. Hence, identify compound B.arrow_forward1. The EI-MS of methylcyclohexane is shown below. Locate the following information in it: CH3 (a) The molecular ion. (b) The base peak. (c) The Mt - C3H7 fragment ion. 83 100 55 80 60 98 40 27 69 20 60 70 80 90 100 20 30 40 50arrow_forward
- For protonated phenylalanine, [M+H]*, what would the approximate percent intensity of the M+1 isotope peak relative to the monoisotopic base peak? 22% 15% 10% 7% 18%arrow_forwardUsing the mass spectrum below select the most likely fragment that produc peak at 57: 100 Relative Intensity 80- 40 20 0- 10 15 20 25 30 35 OC₂H4O+ C3HO+ C₂HO₂+ CH₂O3+ 40 45 50 m/z 55 60 65 70 75arrow_forwardThe El mass spectrum of an unknown compound is given below. Interpret the spectrum and identify the structure of the compound from the characteristic fragments. 94 M+ = 122 65 107 51 77 100 120 130 40 110 m/zarrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage LearningEBK A SMALL SCALE APPROACH TO ORGANIC LChemistryISBN:9781305446021Author:LampmanPublisher:CENGAGE LEARNING - CONSIGNMENT