BIOCHEMISTRY
9th Edition
ISBN: 2818440090622
Author: BERG
Publisher: MAC HIGHER
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Question
Chapter 34, Problem 14P
Interpretation Introduction
Interpretation:
The mechanism of the reaction between opsin and 11-cis retinal should be determined.
Concept introduction:
The retinal is a conjugate chromophore of the human eye. The retinal in normal conditions is present in the 11-cis-retinal configuration. In the presence of light, it is straightened and converted into the all-trans-retinal configuration. This opsin pushes the retina that triggers chemical signaling cascade andresults in the perception of the light by the brain.
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9. Which one of the compounds below is the major organic product obtained from
the following reaction sequence, starting with ethyl acetoacetate?
요요.
1. NaOCH2CH3
CH3CH2OH
1. NaOH, H₂O
2. H3O+
3. A
OCH2CH3
2.
ethyl acetoacetate
ii
A
3. H3O+
OH
B
C
D
E
7. Only one of the following ketones cannot be made via an acetoacetic ester
synthesis. Which one is it?
Ph
کہ
A
B
C
D
E
2. Which one is the
major organic
product obtained
from the following
reaction sequence?
HO
A
OH
1. NaOEt, EtOH
1. LiAlH4
EtO
OEt
2. H3O+
2. H3O+
OH
B
OH
OH
C
-OH
HO
-OH
OH
D
E
.CO₂Et
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