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Phosphazenes are a class of chemical compounds in which a phosphorus atom is covalently linked to a nitrogen atom by a double bond and to three other atoms or radicals by single bonds. While other substitutions produce relatively persistent compounds, in organic synthesis the term largely refers to species with three amino substituents bound to phosphorus. The compounds are unusually stable examples of the phosphorane class of molecules and have a remarkable proton affinity. As such, they are one of the eminent examples of neutral, organic superbases. Two examples are hexachlorocyclotriphosphazene and bis(triphenylphosphine)iminium chloride. Phosphazenes are also known as iminophosphoranes and phosphine imides . The corresponding polymers are polyphosphazenes. Phosphazene bases Phosphazene bases are strong non-metallic non-ionic and low-nucleophilic bases. They are stronger bases than regular amine or amidine bases such as Hünig's base or DBU. Protonation takes place at a

Trifluoromethanesulfonic acid IUPAC name Trifluoromethanesulfonic acid Other names Triflic acid Identifiers CAS number 1493-13-6   PubChem 62406 ChemSpider 56192   ChEBI CHEBI:48511   Jmol -3D images Image 1 Properties Molecular formula CF 3 SO 3 H Molar mass 150.08 g/mol Appearance Colorless liquid Density 1.696 g/mL Melting point -40 °C Boiling point 162 °C Solubility in water Miscible Hazards Main hazards Corrosive, eye irritant   (what is this?)    (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references Trifluoromethanesulfonic acid , also known as triflic acid , TFMS , TFSA , HOTf or TfOH , is a sulfonic acid with the chemical formula CF 3 SO 3 H. It is one of the strongest acids . Triflic acid is mainly used in research as a catalyst for esterification .

Superacid adalah asam yang lebih kuat dari asam sulfat 100%. Bahkan, beberapa diantaranya bisa mencapai 10 7 sampai 10 9 kali lebih kuat. Ada empat macam superacid: Bronsted, Lewis, konjugat Bronsted-Lewis, dan superacid padat. Superacid Bronsted yang umum adalah asam perklorat (HClO 4 ). Ketika dilarutkan dalam asam sulfat murni, asam sulfat malah bertindak sebagai basa: