Polyphosphoric acids

Base Information

• Chemical Name: Polyphosphoric acids
• CAS No.: 8017-16-1
• Molecular Formula: Unspecified
• Molecular Weight: 81.99580
• Hs Code.: 28092000
• Mol file: 8017-16-1.mol

Synonyms:Condensedphosphoric acids;Phospholeum;Phosphoric acid, poly-;Super Phos 105;HSDB 1176;Superphosphoric acid;Tetraphosphoric acid;poly phosphoric acid;

Chemical Property of Polyphosphoric acids

Chemical Property:

• Appearance/Colour: liquid
• Vapor Pressure: 2 hPa (20 °C)
• Melting Point: 16oC
• Boiling Point: 300oC
• PKA: 0.91[at 20 ℃]
• PSA: 81.00000
• Density: 2.06
• LogP: -0.63930
• Storage Temp.: Store below +30°C.
• Sensitive.: Hygroscopic
• Water Solubility.: MAY DECOMPOSE

Purity/Quality:

99% min ^*data from raw suppliers

Polyphosphoric Acid ^*data from reagent suppliers

Safty Information:

• Pictogram(s): R34:
• Hazard Codes: C
• Statements: 34
• Safety Statements: 45-36/37/39-25-26

MSDS Files:

SDS file from LookChem

Useful:

• General Description: Polyphosphoric acid (PPA), also known as condensed phosphoric acids, superphosphoric acid, or tetraphosphoric acid, is a highly reactive and versatile reagent used in organic synthesis, particularly for facilitating cyclization and condensation reactions. In the described study, PPA served as both a solvent and a catalyst, enabling the unexpected formation of 2,6,8-triaryl-1,3,7-triazapyrenes from 1,8-diaminonaphthalene and aromatic nitriles through a proposed mechanism involving electrophilic attack and aromatization. Its strong acidic and dehydrating properties promote complex transformations, making it valuable for synthesizing heterocyclic compounds under high-temperature conditions.

Refernces

Unexpected result from the interaction of 1,8-diaminonaphthalene with aromatic nitriles in polyphosphoric acid [4]

10.1007/s10593-007-0106-x

The research article from "Chemistry of Heterocyclic Compounds" discusses an unexpected outcome from the interaction of 1,8-diaminonaphthalene with aromatic nitriles in polyphosphoric acid (PPA). The researchers initially expected the formation of 2-Ar-perimidines or their acylated products but instead discovered the formation of previously unknown 2,6,8-triaryl-1,3,7-triazapyrenes. The reaction mechanism is proposed to involve the formation of a 2-Ar-perimidine, followed by electrophilic attack by the nitrile cation, cyclization, and aromatization via ammonia elimination. The general method involved mixing 1,8-diaminonaphthalene, an aromatic nitrile, and PPA, stirring at 180°C, then cooling, adding water, basifying with ammonia, and extracting with ethyl acetate. The products were characterized using 1H NMR spectroscopy, and their yields and melting points were reported. The study also included elemental analysis to confirm the composition of the synthesized compounds.