4-Phenoxybenzoic acid

This is a structurally deliberate scaffold, not a simple benzoic acid derivative. The phenoxy linkage increases molecular bulk, hydrophobicity, and conformational stability—features intentionally exploited in downstream chemistry. 4-Phenoxybenzoic acid is a rigid, aromatic carboxylic acid consisting of a benzoic acid core linked through an ether bond to a phenyl ring at the para position.