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The developing fetus is most vulnerable to toxins, drugs, and infections during the first trimester of pregnancy because all of the basic structures and organ systems develop during this time.
Cyclopentene
A cyclic alkene with a five-membered ring, characterized by the presence of a carbon-carbon double bond, making it reactive in chemical syntheses.
Hydrogenation
The chemical reaction where hydrogen is added to another compound, often used to convert unsaturated bonds to saturated ones in hydrocarbons.
Bredt's Rule
A principle stating that bridged bicyclic compounds cannot have a double bond at a bridgehead position unless one of the rings contains at least eight carbon atoms, due to stability issues.
Stable Diene
A type of organic compound with two double bonds that exhibits stability in its structure and reactivity.
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