Not sure how to do the expanded structure for these… (if you can only answer one, can you do letter E?) All of them would be awesome though! Thank you!
Basics in Organic Reactions Mechanisms
In organic chemistry, the mechanism of an organic reaction is defined as a complete step-by-step explanation of how a reaction of organic compounds happens. A completely detailed mechanism would relate the first structure of the reactants with the last structure of the products and would represent changes in structure and energy all through the reaction step.
Heterolytic Bond Breaking
Heterolytic bond breaking is also known as heterolysis or heterolytic fission or ionic fission. It is defined as breaking of a covalent bond between two different atoms in which one atom gains both of the shared pair of electrons. The atom that gains both electrons is more electronegative than the other atom in covalent bond. The energy needed for heterolytic fission is called as heterolytic bond dissociation energy.
Polar Aprotic Solvent
Solvents that are chemically polar in nature and are not capable of hydrogen bonding (implying that a hydrogen atom directly linked with an electronegative atom is not found) are referred to as polar aprotic solvents. Some commonly used polar aprotic solvents are acetone, DMF, acetonitrile, DMSO, etc.
Oxygen Nucleophiles
Oxygen being an electron rich species with a lone pair electron, can act as a good nucleophile. Typically, oxygen nucleophiles can be found in these compounds- water, hydroxides and alcohols.
Carbon Nucleophiles
We are aware that carbon belongs to group IV and hence does not possess any lone pair of electrons. Implying that neutral carbon is not a nucleophile then how is carbon going to be nucleophilic? The answer to this is that when a carbon atom is attached to a metal (can be seen in the case of organometallic compounds), the metal atom develops a partial positive charge and carbon develops a partial negative charge, hence making carbon nucleophilic.
![3. On a separate page, draw the expanded structures for the amino acids and small peptides
(A through E) below. Assume that EVERY NH2 group is protonated (to form NH3*) and
that EVERY COOH group is deprotonated (to form COO).
A. Lysine
B. Arginine
C. The dipeptide composed
of arginine & threonine
D. The tripeptide Glutathione
(check the internet for the
primary structure of glutathione,
it's a little tricky)
Post lab questions 3, 4 and 5 have
NOTHING to do with the actual experiment
you performed, when you ran a number of
dyes in an electrophoresis box in the lab. Post
lab questions 3, 4, and 5 are asking about a
hypothetical electrophoresis experiment. In
question 3 (at left) you'll find the names of the
five molecules that were run in that hypothetical
electrophoresis experiment. An illustration of the
gel, after that hypothetical run was complete, is on
the next page. Additionally, an unknown was run
in lane 8 of the gel box in this hypothetical
experiment.
E. The polypeptide
GLU-GLY-MET-LEU
NOTE that GLU
is NOT
glutamine!!](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb99220ad-d702-4943-b904-ec3abe399c73%2F9fe743bb-b50e-4fac-b92d-a315719709b9%2F50d6p4g_processed.jpeg&w=3840&q=75)
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