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o‐Phthalaldehyde is, to this day, the only aromatic aldehyde that can be homopolymerized through chain‐growth polymerization. The product, polyphthalaldehyde (PPA), is a brittle white solid, and, having a polyacetal main chain, presents the ability to depolymerize quite rapidly in the presence of an acid. This review highlights the unique polymerization chemistry of o‐phthalaldehyde since its discovery...
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