Introduction to General, Organic and Biochemistry
12th Edition
ISBN: 9780357391594
Author: Frederick A. Bettelheim; William H. Brown; Mary K. Campbell
Publisher: Cengage Learning US
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Chapter 15, Problem 53P
16-58 Following is a structural formula of desosamine, a
sugar component of several macrolide antibiotics, including the erythromycins. The configuration shown here is that of the natural product. Erythromycin is produced by a strain of Streptomyces erythreus originally found in a soil sample from the Philippine Archipelago.
ch3
T
Desosamine
- Name all the
functional groups in desosamine. (Chapter 10) - How many stereocenters are present in desosamine? How many stereoisomers are possible for it? How many pairs of enantiomers are possible for it?
- Draw the alternative chair conformations for desosamine and label which groups are equatorial and which are axial.
(d > Which of the alternative chair conformations for desosamine is more stable?
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Part VII. The H-NMR of a compound with molecular formula C5 H 10 O2 is given below.
Find the following:
(a) The no. of protons corresponding to each signal in the spectra
(6) Give the structure of the compound and assign the signals to each
proton in the compound.
a
70.2
Integration Values
C5H10O2
b
47.7
C
46.5
d
69.5
3.6 3.5
3.4 3.3 3.2 3.1 3.0
2.9 2.8
2.7
2.6 2.5
2.4 2.3 2.2 2.1 2.0
Chemical Shift (ppm)
1.9
1.8
1.7 1.6
1.5
1.4 1.3 1.2
1.1 1.0
0.9 0.8
Part 111. 1 H-NMR spectrum of a compound with integration values in red is given below.
Answer the following:
(a) write the signals in the 'H-NMR spectrum to the corresponding protons on the structure
of the molecule below.
(b) Identify the theoretical multiplicities for each proton in the compound. Also give the possible.
complex splitting patterns assuming J values are not similar.
там
Br
22
2
3
6
4 7.2 7.0 6.8 6.6 6.4 6.2 6.0 5.8 5.6 5.4 5.2 5.0 4.8 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0
Chemical Shift (ppm)
ra.
Br
2
3
6
6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
Chemical Shift (ppm)
2
2
Br
7.3
7.2
7.1
7.0 6.9
6.7 6.6 6.5
6.4
6.3
6.2
6.1
6.0
Chemical Shift (ppm)
5.9
5.8 5.7
5.5 5.4 5.3 5.2
5.0 4.9
1600°
1538°C
1493°C
In the diagram, the letter L indicates
that it is a liquid. Indicate its
components in the upper region
where only L is indicated.
The
iron-iron carbide phase
diagram.
Temperature (°C)
1400
8
1394°C
y+L
1200
2.14
y, Austenite
10000
912°C
800a
0.76
0.022
600
400
(Fe)
a, Ferrite
Composition (at% C)
15
1147°C
a + Fe3C
2
3
Composition (wt% C)
L
2500
4.30
2000
y + Fe3C
727°C
1500
Cementite (Fe3C)
1000
4
5
6
6.70
Temperature (°F)
Chapter 15 Solutions
Introduction to General, Organic and Biochemistry
Ch. 15.1 - Prob. 15.1QCCh. 15.2 - Problem 16-2 Write a structural formula for each...Ch. 15.2 - Prob. 15.3QCCh. 15.3 - Problem 16-4 Select the stronger base from each...Ch. 15.3 - Prob. 15.5QCCh. 15 - 16-6 Answer true or false. te/7-Butylamine is a 3°...Ch. 15 - Prob. 2PCh. 15 - Prob. 3PCh. 15 - 16-9 In what way are pyridine and pyrimidine...Ch. 15 - Prob. 5P
Ch. 15 - Prob. 6PCh. 15 - Prob. 7PCh. 15 - 16-13 Classify each amino group as primary,...Ch. 15 - Prob. 9PCh. 15 - 16-15 There are eight primary amines with the...Ch. 15 - Prob. 11PCh. 15 - 16-17 Propylamine (bp 48°C), ethylmethylamine (bp...Ch. 15 - 16-18 Account for the fact that 1-butanamine (bp...Ch. 15 - 16-19 2-Me thy 1 propane (bp -12°C), 2-propanol...Ch. 15 - Prob. 15PCh. 15 - Prob. 16PCh. 15 - Prob. 17PCh. 15 - Prob. 18PCh. 15 - Prob. 19PCh. 15 - Prob. 20PCh. 15 - 16-26 The p/fb of amphetamine is approximately 3.2...Ch. 15 - 16-27 Guanidine, p/Ca 13.6, is a very strong base,...Ch. 15 - 16-28 Following is the structural formula of...Ch. 15 - Prob. 24PCh. 15 - Prob. 25PCh. 15 - Prob. 26PCh. 15 - 16*32 Many tumors of the breast are correlated...Ch. 15 - Prob. 28PCh. 15 - Prob. 29PCh. 15 - Prob. 30PCh. 15 - (Chemical Connections 15B ) Identify all...Ch. 15 - Prob. 32PCh. 15 - Prob. 33PCh. 15 - Prob. 34PCh. 15 - Prob. 35PCh. 15 - Prob. 36PCh. 15 - (Chemical Connections 15D ) Suppose you saw this...Ch. 15 - Prob. 38PCh. 15 - Prob. 39PCh. 15 - Prob. 40PCh. 15 - 16-46 Arrange these three compounds in order of...Ch. 15 - Prob. 42PCh. 15 - Prob. 43PCh. 15 - Prob. 44PCh. 15 - Prob. 45PCh. 15 - Prob. 46PCh. 15 - Prob. 47PCh. 15 - Prob. 48PCh. 15 - 16-54 Several poisonous plants, including Atropa...Ch. 15 - Prob. 50PCh. 15 - Prob. 51PCh. 15 - Prob. 52PCh. 15 - 16-58 Following is a structural formula of...Ch. 15 - Prob. 54P
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