4 formyl carbaldehyde not stable ?

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No title

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James Demers

"4 formyl carbaldehyde" is insufficient to indicate a structure. You might want to provide a drawing, or better yet a reaction scheme.

Jack M Hinkley

I agree. Your nomenclature is not descriptive. A complete reaction scheme showing all the end products should provide insight into your problem. Too often a reaction scheme shows only the desired product and ignores the byproducts.