# 1.8: Reactions at the α-Carbon, Part II (Summary)

Before moving on to the next chapter, you should:

• Be able to draw reasonable mechanisms for reactions of the following type:
• Decarboxylation of a $$\beta$$-carboxy ketone or aldehyde
• Claisen condensation and retro-Claisen cleavage
• Hybrid decarboxylation-Claisen condensation
• $$E1cb$$ elimination
• Understand (though not necessarily memorize) the fatty acid synthesis and degradation cycles, and how the Claisen. retro-Claisen, conjugate addition, and $$E1cb$$ elimination steps fit in.