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Olefins and dienes

Fulvalene

Also known as bicyclopentadienylidene, Pentafulvalene, fulvaleno

CAS 91-12-3Formula C10H8Molar mass 128.17 g/mol
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Fulvalene chemical structure, C10H8, CAS 91-12-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
91-12-3
Formula
C10H8
Molar mass
128.17 g/mol
HS code
290219
Category
Olefins and dienes

What is Fulvalene?

Plain description, key identifiers and synonyms

Fulvalene is a cyclic hydrocarbon that consists of two cyclopentane rings connected via a C=C bond between the methylene groups. It is a cyclic hydrocarbon and a member of fulvalenes.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
5-cyclopenta-2,4-dien-1-ylidenecyclopenta-1,3-diene
CAS number
91-12-3 CAS number cross-checked
Molecular formula
C10H8
UNII
V2K3QQS6YW
InChIKey
XEOSBIMHSUFHQH-UHFFFAOYSA-N
InChI
InChI=1S/C10H8/c1-2-6-9(5-1)10-7-3-4-8-10/h1-8H
SMILES (canonical and isomeric)
C1=CC(=C2C=CC=C2)C=C1

Synonyms

  • bicyclopentadienylidene
  • Pentafulvalene
  • fulvaleno
  • Fulvalen
  • [5,5']bicyclopentadienylidene
  • 1,1'-Bi(cylopentadienylidene)
  • 5-(2,4-cyclopentadien-1-ylidene)-1,3-cyclopentadiene
  • BI-2,4-cyclopentadien-1-ylidene
  • 1,1'-bi[cylopentadienylidene]
  • 1,1'-bi(cyclopenta-2,4-dien-1-ylidene)
  • 1,3-Cyclopentadiene, 5-(2,4-cyclopentadien-1-ylidene)-
  • (5,5')bicyclopentadienylidene
  • [1,1'-bi(cyclopentylidene)]-2,2',4,4'-tetraene
  • 1,1'-bi(cyclopentadienylidene)
  • 1,1'-bi[cyclopentadienylidene]
  • (1,1'-bi(cyclopentylidene))-2,2',4,4'-tetraene
  • Bicyclopentyliden-2,4,2',4'-tetraene
  • 5-cyclopenta-2,4-dien-1-ylidenecyclopenta-1,3-diene

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
128.17 g/molcalc.
Exact mass
128.0626 Dacalc.
LogP (octanol/water)
2.54calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
10calc.
Rings
2calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
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, C1=CC(=C2C=CC=C2)C=C1

C1=CC(=C2C=CC=C2)C=C1

2 rings, 10 atoms. This chemical is the scaffold itself.

5 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.

Fulvalene suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

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Fulvalene 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

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

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 Fulvalene is traded under.

HS 2902.19Indicative HS code

Cyclanes, cyclenes and cycloterpenes, other

World exports in 2024
$979M
+24.3% vs 2023, imports $1B
2019 to 2024
Top exporters
  1. China23.4%
  2. United States20.6%
  3. Germany13.6%
Top importers
  1. India * partner reported9.9%
  2. United States9.8%
  3. South Korea9.5%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Fulvalene?

Fulvalene is a cyclic hydrocarbon that consists of two cyclopentane rings connected via a C=C bond between the methylene groups. It is a cyclic hydrocarbon and a member of fulvalenes.

What is the CAS number of Fulvalene?

The CAS registry number of Fulvalene is 91-12-3.

What is the molecular formula and weight of Fulvalene?

The molecular formula of Fulvalene is C10H8 and its molar mass is 128.17 g/mol.

Is Fulvalene hazardous?

No GHS hazard classification for Fulvalene 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 Fulvalene?

Fulvalene is usually classified under HS code 290219 (Cyclanes, cyclenes and cycloterpenes, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Fulvalene?

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What is the price of Fulvalene?

Suppliers quote Fulvalene 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 Fulvalene

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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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