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Heterocyclic building blocks

Pyrylium

Also known as pyranium, pyrylium cation, pyrylium ion

CAS 289-67-8Formula C5H5O+Molar mass 81.09 g/mol
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Pyrylium chemical structure, C5H5O+, CAS 289-67-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
289-67-8
Formula
C5H5O+
Molar mass
81.09 g/mol
HS code
293299
Category
Heterocyclic building blocks

What is Pyrylium?

Plain description, key identifiers and synonyms

Pyrylium is the simplest member of the class of pyryliums that is pyran with a protonated oxygen.

Pyrylium is an organic cation.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
pyrylium
CAS number
289-67-8 CAS number cross-checked
Molecular formula
C5H5O+
InChIKey
WVIICGIFSIBFOG-UHFFFAOYSA-N
InChI
InChI=1S/C5H5O/c1-2-4-6-5-3-1/h1-5H/q+1
SMILES (canonical and isomeric)
C1=CC=[O+]C=C1

Synonyms

  • pyranium
  • pyrylium cation
  • pyrylium ion
  • Pyran-1-ium

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
81.09 g/molcalc.
Exact mass
81.0335 Dacalc.
LogP (octanol/water)
1.56calc.
Topological polar surface area
11.3 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
6calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0calc.
Formal charge
1calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1cc[o+]cc1

c1cc[o+]cc1

1 ring, 6 atoms. This chemical is the scaffold itself.

24 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Pyrylium suppliers

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Where suppliers are based

1 supplier in 1 country

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Pyrylium price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Pyrylium is traded under.

HS 2932.99Indicative HS code

Heterocyclic compounds with oxygen hetero-atom(s) only, other

World exports in 2024
$3.81B
+10.3% vs 2023, imports $7.05B
2019 to 2024
Top exporters
  1. China28.9%
  2. Switzerland * partner reported12.7%
  3. Germany7.8%
Top importers
  1. United States49.7%
  2. China11.9%
  3. India * partner reported3.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Pyrylium is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Pyrylium, based on the data on this page

What is Pyrylium?

Pyrylium is the simplest member of the class of pyryliums that is pyran with a protonated oxygen.

What is the CAS number of Pyrylium?

The CAS registry number of Pyrylium is 289-67-8.

What is the molecular formula and weight of Pyrylium?

The molecular formula of Pyrylium is C5H5O+ and its molar mass is 81.09 g/mol.

What is Pyrylium used for?

Known uses and roles of Pyrylium include building blocks in research and laboratory and screening compounds in research and laboratory.

Is Pyrylium hazardous?

No GHS hazard classification for Pyrylium is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Pyrylium?

Pyrylium is usually classified under HS code 293299 (Heterocyclic compounds with oxygen hetero-atom(s) only, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Pyrylium?

CompoundList lists 1 supplier of Pyrylium in Germany. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Pyrylium?

Suppliers quote Pyrylium on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Pyrylium

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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