2-Pentene, (2E)-

Also known as: (2E)-2-Pentene, (E)-2-Pentene, 2-(E)-C5H10, EINECS 203-695-0, MFCD00009384, SYM-METHYLETHYLETHYLENE, TRANS-2-AMYLENE, TRANS-2-PENTENE, TRANS-B-N-AMYLENE, TRANS-SYM-METHYLETHYLETHYLENE, trans-2-Pentene, trans-2-pentene

2-Pentene, (2E)- (CAS 646-04-8) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C5H10 and a molecular weight of 70.13290 g/mol. Key properties include a melting point of -140ºC, a boiling point of 37ºC, a density of 0.64 and a flash point of -18ºC. It is classified under GHS with signal word Danger and hazard statements H224, H304 and H315 — Causes skin irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 646-04-8
Jingsj CID: J-939-1
Molecular Formula: C₅H₁₀
Molecular Weight: 70.13290 g/mol
Category: Aliphatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	-140ºC
Boiling Point	37ºC
Density	0.64
Flash Point	-18ºC
Exact Mass	70.07830
LogP	1.97250
Vapor Pressure	8.06 psi ( 20 °C)
Refractive Index	n20/D 1.381

GHS Safety & Compliance

Flammable / Irritant / Health HazardSignal word: Danger

H224
H304
H315 — Causes skin irritation
H319 — Causes serious eye irritation
H335 — May cause respiratory irritation

Frequently Asked Questions

What is the CAS number of 2-Pentene, (2E)-?

The CAS number of 2-Pentene, (2E)- is 646-04-8.

What are the molecular formula and molecular weight of 2-Pentene, (2E)-?

2-Pentene, (2E)- has molecular formula C5H10 and molecular weight 70.13290 g/mol.

Is 2-Pentene, (2E)- hazardous?

2-Pentene, (2E)- has GHS signal word Danger and hazard statements H224; H304; H315 — Causes skin irritation.

What are the upstream and downstream products of 2-Pentene, (2E)-?

For 2-Pentene, (2E)-, Upstream Products: Pent-1-yne, Pent-2-yne, Pent-1-ene; Downstream Products: (2S)-2-Pentanol, (R)-(-)-2-Pentanol, 3-Pentanol.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "2-Pentene, (2E)- (CAS 646-04-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-939-1 (accessed 2026-11-07).

Data for reference only; verify product details with suppliers before purchase.