Is Acetaldehyde a Good Nucleophile for Aromatic Substitution?

[Deathcrush]

Does anyone know if an aldehyde, specifically, acetaldehyde behaves as a good nucleophile? I'm trying to insert an aldehyde in an aromatic compound through an aromatic nucleophilic substitution, any information or source to pKa data would also be appreciated, thanks!

 

[chemisttree]

Are you trying to preserve the aldehyde functionality in your product? Are you trying to fomylate an aromatic group? Is the aromatic group electron rich?

 

[Deathcrush]

Yes, actually I want to do the molecule attached, as you can see, it is not an activated system, that's why I thought I could use aromatic nucleophilic substitution