Predict the major, organic product for the following reaction.

• A.
• B.
• C.
• D.

Answer: (A)

Verified step by step guidance

1. Identify the reaction type: The presence of LnRu=CH2 suggests a metathesis reaction, specifically an olefin metathesis, which involves the redistribution of alkene fragments.
2. Analyze the starting material: The compound is a bicyclic structure with two terminal alkenes. This setup is ideal for ring-closing metathesis (RCM), which can form a new ring by connecting the two alkene ends.
3. Consider the possible products: The reaction can lead to different ring sizes depending on which alkenes participate in the metathesis. The most likely product is the one that forms the most stable ring, often a five or six-membered ring.
4. Evaluate the stability and symmetry: The images provided show meso and achiral products, indicating that the reaction favors symmetrical and stable structures. This suggests that the reaction will likely form a product with these characteristics.
5. Predict the major product: Based on the stability and symmetry considerations, the major product is likely to be a meso and achiral compound, possibly forming a new ring that maintains these properties.