When properly assigning absolute configuration to a specific stereocenter using the CIP sequence rules, a tie-breaker is frequently required for multiple bonds. How is a carbon atom possessing a doubl

Question

When properly assigning absolute configuration to a specific stereocenter using the CIP sequence rules, a tie-breaker is frequently required for multiple bonds. How is a carbon atom possessing a double bond to an oxygen atom ($-C=O$) formally treated?

Prashant Kotian · Accepted Answer

Correct answer: B. According to strict CIP sub-rules, any multiple bond is mathematically expanded. A double bond is treated stereochemically as if the Carbon is single-bonded to two separate Oxygen "pseudo-atoms," and the Oxygen is reciprocally bonded to two Carbon atoms.

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