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β-Lactamase inhibitors work by blocking the activity of β-lactamase enzymes.
Some species of bacteria, such as MRSA, (Methicillin-resistant Staphylococcus aureus) develop resistance to β-lactam (penicillin-like) antibiotics by producing enzymes called β-lactamases.
The β-lactamases act by hydrolyzing the amide linkage of the β-lactam ring.
Breaking the β-lactam ring deactivates the antibiotic, and the microorganism then becomes resistant to that antibiotic.
To overcome this resistance, β-lactam antibiotics such as amoxicillin are often combined with a β-lactamase inhibitor like clavulanic acid.
The clavulanic acid acts as a “suicide molecule”.
It binds strongly to β-lactamases and deactivates them.
The amoxicillin can then attack the bacteria that have not yet developed resistance.
I would recommend using note cards.
First familiarize yourself with the rules of nomenclature for organic compounds.
Then draw the structural formula of a compound (I'm assuming you have been given a list) on one side of a note card, and the name on the other side, which is a tactile learning style.
Study them, look for the application of the rules to the names of the compounds. Then quiz yourself until you have them memorized. While studying, look for patterns, such as similarities and differences, which involves both a visual learning style and critical thinking.
You can also say the names orally, which will touch on the auditory learning style, and it's much easier to remember a word if you can pronounce it (even if your pronunciation is atypical).
My technique is to go through the cards and set aside the ones that I already know. Then I study the rest and add back the ones I already know. Then I go through all the cards again, and set aside the ones I got right (hopefully there will be more). Then I study the remaining cards, and add back the cards I already know. I keep doing this until I am able to get all of the names correctly from their structural formulas, and understand why they are named that way.
This will take some investment of your time, but it is a very useful studying tool and works for many different subjects.
Here's what I get for a retrosynthesis.
You don’t identify the starting materials but, if I haven’t gone back far enough, you can probably develop appropriate retrosyntheses.
I'm starting with benzene, acetic acid, ethylene oxide. and dimethylamine.
The structure of 2-[1-(4-bromophenyl)-1-phenylethoxy]-N,N-dimethylethanamine is
The central part of the molecule is an ether. We could do a retro-Williamson ether synthesis.
Retrosynthesis of the (N,N-dimethylamino)ethyl chloride is relatively straightforward.
We can make the chloride from an alcohol, and the alcohol comes from the reaction of dimethylamine with ethylene oxide.
The remaining retrosyntheses are mostly combinations of Friedel-Crafts and Grignard reactions.
Only one of the isomers is effective because it is the one that fits the receptor site on the enzyme involved in pain perception.
What ibuprofen does
Ibuprofen is works by inhibiting two enzymes called COX-1 and COX-2.
They convert arachidonic acid to prostaglandin H2 (PGH2) which, in turn, is converted by other enzymes to other prostaglandins that activate the body's response to inflammation.
How ibuprofen does it
Ibuprofen is 2-(4-isobutylphenyl)propanoic acid. Its structure is
Note the chiral centre at
Why only the
If we use the lock-and-key theory of enzyme action, we say that (
When it occupies the receptor site, it blocks access to the COX activators.
The production of PGH2 ceases along with the pain and fever caused by the body's inflammatory response.
They form due to the movement and attractions of electrons in atoms and molecules.
A dipole is the separation of two opposite charges, or, in this case, partial charges.
To answer your question, we have to distinguish between the different types of dipoles. There are three different types of dipole:
Permanent dipoles exist in molecules with covalent bonding where one atom is more electronegative than the other. The atom which is more electronegative attracts the bonded pair of electrons to it, increasing its electron density. It thus becomes slightly negative (
Oscillating dipoles occur by chance due to the random movement of electrons in atoms. At any point, the electrons in an atom can all be concentrated on one end, reducing the electron density of the other. This causes one end of the atom to become
Induced dipoles form when a molecule with a permanent or oscillating dipole approaches a non-polar molecule (or the other way around). As the non-polar molecule approaches the polar one, its electrons will be attracted to the
This sort of dipole can also form when a non-polar molecule approaches an ionic molecule.
The halogenation of benzene is an electrophilic aromatic substitution reaction.
Electrophilic aromatic substitution
Electrophilic aromatic substitution is a reaction in which an atom on a aromatic ring is replaced by an electrophile.
A typical halogenation reaction is
The electrophile is an ion that is generated by the catalyst.
Step 1. Generation of the electrophile
A Lewis acid catalyst, usually
Step 2. Electrophilic attack on the aromatic ring
The nucleophilic π electrons of the aromatic ring attack the electrophilic
Step 3: Loss of
This re-forms the aromatic ring, produces
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