Knowra Phthalic acid Phthalic acid Phthalic acid is an aromatic dicarboxylic acid with two adjacent carboxyl groups on a benzene ring. Its systematic name is benzene-1,2-dicarboxylic acid.
Benzene : Benzene is a six-carbon aromatic hydrocarbon with a planar ring and delocalized π electrons. Its ring forms the aromatic framework to which phthalic acid’s two carboxyl groups are attached.
Phthalic anhydride : Phthalic anhydride is a cyclic acid anhydride formed by dehydration of phthalic acid. Adjacent carboxyl groups can close into this five-membered anhydride ring when water is removed.
Plasticizer : A plasticizer is an additive that increases a material’s flexibility, workability, or softness. Some phthalic-acid-derived esters are used to make plastics more flexible.
Isophthalic acid : Isophthalic acid is benzene-1,3-dicarboxylic acid, with carboxyl groups in the meta positions. Its 1,3 substitution pattern contrasts with phthalic acid’s adjacent 1,2 arrangement.
Carboxylic acid : A carboxylic acid is an organic compound containing one or more carboxyl groups, –COOH. Phthalic acid belongs to this family and contains two carboxyl groups.
Phthalate : A phthalate is a salt or ester derived from phthalic acid. Loss of one or both acidic protons produces phthalate ions and their derivatives.
Alkyd resin : An alkyd resin is a polyester made from polyols, polyacids or anhydrides, and fatty acids or oils. Phthalic anhydride, commonly made from phthalic acid, supplies aromatic units for alkyd resins.
Terephthalic acid : Terephthalic acid is benzene-1,4-dicarboxylic acid, with carboxyl groups opposite each other on the ring. Its para arrangement is the third positional isomer of benzene dicarboxylic acid.
Aromaticity : Aromaticity is the unusual stability associated with cyclic, conjugated systems containing delocalized electrons. The benzene ring retains aromatic character despite bearing two carboxyl substituents.
Phthalimide : Phthalimide is a cyclic imide containing a benzene ring fused to a five-membered imide ring. Reaction of phthalic anhydride with ammonia can produce this cyclic nitrogen compound.
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