Integrated SequencePhysics Chemistry Organic Biology

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Reactions of Alkenes

Integration of Metabolism

Here is another interesting context for electrophilic addition in biochemistry. A carbocation can electrophilically attack a double bond, the result being the elongation of the hydrocarbon in a polymerization reaction. A variation of this process occurs in the biosynthesis of the isoprene derived lipids, the terpenes and steroids. Isoprene is a key precursor in lipid biosynthesis. In an early stage in the process isopentyl pyrophosphate combines with the allylic carbocation derivative of its isomer (dimethylallyl pyrophosphate). Two C5 units have combined to form a C10 unit.

The question for the MCAT is not whether you can memorize the sequence detailed above, but whether you can comprehend it.

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