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Pyrylium is a
cation (positive ion) with
formula C5H5O+,
consisting of a six-membered ring of five
carbon atoms, each with one
hydrogen atom, and one positively...
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analogous to the
pyrylium cation with the
oxygen atom
replaced by a
sulfur atom.
Thiopyrylium salts are less
reactive than the
analogous pyrylium salts due to...
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carbon atom, but
actually selenium is
substituted for the
oxygen atom in
pyrylium. In the Hantzsch-Widman
system of nomenclature, it is
called seleninium...
- 4H-pyran
easily disproportionates to the
corresponding dihydropyran and the
pyrylium ion,
which is
easily hydrolyzed in
aqueous medium.
Although the pyrans...
- and
chromenylium (also
called benzopyrylium) is a
bicyclic version of
pyrylium. The
positive charge can move
around the molecule. At
least 31 monomeric...
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Pyrylium-1 (Py-1) is a
fluorogenic salt of a
pyrylium derivative and tetrafluoroborate. It is an amine-labeling dye that is not
fluorescent itself, but...
- borabenzene, silabenzene, germanabenzene, stannabenzene,
phosphorine or
pyrylium salts the
aromaticity is
still retained.
Aromaticity also
occurs in compounds...
- germabenzene, stannabenzene, pyridine, phosphorine, arsabenzene, bismabenzene,
pyrylium, thiopyrylium, selenopyrylium,
telluropyrylium Dewar included this isomer...
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Triphenylcarbenium (C6H5)3C+
Dihydrogen H+2
Phosphonium PH+4
Cyclopropenium C3H+3
Hydronium H3O+
Trifluoromethyl CF+3
Fluoronium H2F+
Pyrylium C5H5O+
Sulfonium H3S+...
- 6-triphenylphosphabenzene. This is
achieved by
treating 2,4,6-trisubstituted
pyrylium salt with phosphanes. The
first derivative of
arsabenzene was 9-arsaanthracene...
