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CAS 1119-51-3 5-Bromo-1-pentene | Products & Prices & Suppliers

    • 5-Bromo-1-pentene is a chemical compound with the molecular formula C5H9Br. It has the CAS number 1119-51-3. This compound appears as a colorless liquid with a characteristic odor. Its basic structure consists of a pentene chain with a bromine atom attached to the fifth carbon. 5-Bromo-1-pentene is sparingly soluble in water.Applicable Fields

      5-Bromo-1-pentene is commonly used in organic synthesis. Its purpose in this field involves its ability to undergo various reactions, such as nucleophilic substitution and addition reactions. The mechanism of action in organic synthesis depends on the specific reaction being performed.

      Storage

      ConditionsStore in a cool and dry place, away from direct sunlight.

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  • Product Name: 5-Bromo-1-pentene
  • Molecular Weight: 149.031
  • Molecular Formula: C5H9Br
  • Synonyms: 1-Bromo-4-pentene; 1-Pentene, 5-bromo-; 1-pentene,5-bromo-; 2-Pentene,5-bromo-; 3-Pentenylbromide; 4-Pentenyl bromide;

5-Bromo-1-pentene

Physical property characterizationPurification method selectionSolvent handling protocols

⚠ Attention: For research use only. Not for human or veterinary use.
Molecular FormulaC5H9Br
Molecular Weight149.03 g/mol
CAS No.1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Buy 5-Bromo-1-pentene Cas 1119-51-3

Technical Parameters

Basic Identity
Product Name 5-Bromo-1-pentene
CAS 1119-51-3
Synonyms
1-Bromo-4-pentene, 4-Pentenyl Bromide
Molecular Formula C5H9Br
Molecular Weight 149.03 g/mol
Structural Identifiers
SMILES C=CCCCBr
InChI InChI=1S/C5H9Br/c1-2-3-4-5-6/h2H,1,3-5H2
InChIKey LPNANKDXVBMDKE-UHFFFAOYSA-N
Commercial & Availability
Standard Pack Sizes 10 mg / 50 mg / 100 mg / Bulk Custom
Availability In Stock
Custom Synthesis Available on request

Structure & Identifiers

Interactive Chemical Structure Model






5-Bromo-1-pentene (CAS 1119-51-3) for Chemical Sourcing: A Terminal Alkene with Primary Bromide Dual Functionality

5-Bromo-1-pentene (CAS 1119-51-3), also known as 4-pentenyl bromide, is an aliphatic bromoalkene with molecular formula C₅H₉Br and molecular weight 149.03 g/mol [1]. The compound features a terminal C=C double bond at the 1-position and a primary bromide at the 5-position, providing two chemically orthogonal reactive sites in a single building block [2]. This dual functionality enables sequential transformations that are inaccessible with simple alkyl bromides or unfunctionalized alkenes, making it a versatile intermediate in organic synthesis, pharmaceutical development, and polymer chemistry .

Dual reactive sitesTerminal C=C and primary bromide enable orthogonal transformations
Sequential chemistrySupports chemoselective reaction design in multi-step synthesis
Versatile intermediateApplied in organic synthesis, pharmaceutical development, and polymer chemistry

5-Bromo-1-pentene Procurement: Why In-Class Bromoalkene Analogs Cannot Be Directly Substituted

While bromoalkenes as a class share the general feature of combining alkene unsaturation with a bromine leaving group, structural differences in chain length and substitution position critically determine both physical handling properties and synthetic outcomes. The primary bromide in 5-bromo-1-pentene undergoes nucleophilic substitution with minimal steric hindrance, while the terminal alkene participates in addition and cross-coupling reactions with predictable Markovnikov/anti-Markovnikov selectivity [1]. Substituting a shorter-chain analog such as 4-bromo-1-butene (CAS 5162-44-7) introduces a molecular weight differential of approximately 14 g/mol (135.00 vs 149.03) and a corresponding reduction in carbon scaffold length, which directly alters product lipophilicity, chain extension capacity, and the spatial arrangement of downstream functional groups [2]. The following quantitative evidence establishes where 5-bromo-1-pentene demonstrates verifiable differentiation from its closest structural analogs.

Chain length mismatch
C4 analogs alter product lipophilicity and scaffold geometry, affecting downstream molecular properties.
Spatial separation limitation
Shorter chains reduce distance between reactive termini, impacting macrocycle formation and cross-linking efficiency.
Physical property divergence
Boiling point and density differences versus unsubstituted alkenes influence purification and handling protocols.

5-Bromo-1-pentene Technical Evidence: Quantitative Differentiation Data for Sourcing Decisions

Boiling Point and Density Differentiation of 5-Bromo-1-pentene versus Unsubstituted 1-Pentene

The presence of the bromine substituent in 5-bromo-1-pentene substantially increases intermolecular forces relative to unsubstituted 1-pentene, resulting in a boiling point elevation of approximately 96-97°C and a density increase of approximately 0.62 g/mL . This physical property differential directly impacts distillation separation efficiency and solvent compatibility in downstream processing. The elevated boiling point of 5-bromo-1-pentene places it in a distinct volatility class (flash point 30°C, UN1993 Class 3 flammable liquid) compared to its unsubstituted analog [1].

Physical Property
Head-to-head
BP ~126°C / density ~1.26 g/mL vs 1-pentene ~30°C / ~0.64 g/mL
Supports purification method selection and solvent compatibility review.
Density ~2× higher; flash point 30°C (Class 3 flammable liquid).
Physical property characterizationPurification method selectionSolvent handling protocols

Molecular Scaffold Length Differentiation: 5-Bromo-1-pentene (C5) versus 4-Bromo-1-butene (C4)

When selecting a terminal bromoalkene building block for chain extension or scaffold construction, the C5 framework of 5-bromo-1-pentene provides an additional methylene unit relative to the C4 analog 4-bromo-1-butene (homoallyl bromide, CAS 5162-44-7) [1]. This additional carbon translates to a molecular weight increase from 135.00 g/mol to 149.03 g/mol (14.03 g/mol difference) and an increase in rotatable bond count from 2 to 3 [2]. For applications requiring specific spatial separation between the reactive termini—such as macrocycle formation, cross-linking agents, or telechelic polymer precursors—this C5 framework provides critical geometric flexibility that the shorter C4 analog cannot deliver.

Scaffold Length
Head-to-head
C5 vs C4: ΔMW +14.03 g/mol, +1 rotatable bond
C5 framework provides spatial separation for macrocycles and telechelic polymer precursors.
C4 analog (4-bromo-1-butene) provides insufficient separation for certain applications.
Carbon chain extensionLipophilicity modulationSpatial scaffold design

Quantitative Synthesis Yield: 5-Bromo-1-pentene via 1,5-Dibromopentane Dehydrobromination

A documented large-scale synthesis of 5-bromo-1-pentene from 1,5-dibromopentane achieves 80.1% yield under optimized conditions (140°C, 4 h, hexamethylphosphoric triamide in DMF) with final product content of 99% after rectification [1]. This industrially scalable route leverages the readily available and cost-effective starting material 1,5-dibromopentane, establishing a reproducible synthetic pathway that supports consistent bulk supply. In contrast, alternative syntheses using 4-penten-1-ol with CBr₄/PPh₃ or PBr₃ typically operate at smaller laboratory scale and require more expensive reagents [2].

Synthesis Yield
Reported
80.1% yield at 100 kg scale; 99% purity
Supports reliable bulk supply from inexpensive 1,5-dibromopentane.
Patent CN108046980; atmospheric distillation followed by rectification.
Process chemistryScalable synthesisCost-efficient manufacturing

5-Bromo-1-pentene in Stereoselective Synthesis of 7α-(3-Carboxypropyl) Estradiol

5-Bromo-1-pentene is a critical starting material for the stereoselective synthesis of 7α-(3-carboxypropyl) estradiol, a key estradiol analog . This specific application exploits the compound’s C5 bromoalkene framework to install the 3-carboxypropyl side chain at the 7α-position of the steroid nucleus with defined stereochemistry. The required spatial geometry—a five-carbon chain with terminal bromine adjacent to the steroid core—cannot be replicated by shorter bromoalkenes such as 4-bromo-1-butene or 3-bromo-1-propene, which would install chains of insufficient length, nor by longer homologs that would introduce unwanted conformational flexibility or altered pharmacokinetic properties [1].

Steroid Modification
Class-level
Required for 7α-(3-carboxypropyl) estradiol synthesis; C5 chain installs correct side chain
Structural requirement may limit direct substitution with homologs.
Exact yield data not located; structural inference based on chain-length specificity.
Steroid chemistryStereoselective synthesisHormone analog development

5-Bromo-1-pentene CAS 1119-51-3 | Organic Intermediate Manufacturer China

  • High-purity 5-Bromo-1-pentene (CAS 1119-51-3) for pharmaceuticals, agrochemicals, and specialty chemicals. China supplier with competitive price and fast delivery….
CAS : 1119-51-3
Molecular : C5H9Br
EINECS : 214-281-4
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Detailed introduction

5-Bromo-1-pentene Product Introduction

5-Bromo-1-pentene (CAS 1119-51-3) is a bromine-containing organic compound. Its molecule contains both an active bromine atom and a carbon-carbon double bond, resulting in high reactivity. It is widely used in organic synthesis, pharmaceutical intermediates, agrochemical raw materials, and the preparation of specialty chemicals.

This compound serves as an important starting material for the synthesis of nitrogen-containing heterocycles, alcohols, esters, and other fine chemicals. It also has applications in polymer material modification and surface functionalization.

Physical & Chemical Properties

Property Specification
Product Name 5-Bromo-1-pentene
CAS Number 1119-51-3
Molecular Formula C5H9Br
Molecular Weight 149.03 g/mol
Appearance Colorless to light yellow liquid
Purity ≥98%
Boiling Point 130–132°C
Density (20°C) 1.28–1.30 g/cm³
Refractive Index 1.460–1.470
Solubility Insoluble in water; soluble in organic solvents
Shelf Life 12 months

Product Applications

Pharmaceutical intermediates: used in the synthesis of antibacterial drugs, antiviral drugs, and other active molecules

Agrochemicals: important intermediates for the synthesis of pesticides, herbicides, and other products

Polymer materials: used for monomer modification of functional polymers

Fine chemicals: used in the synthesis of surfactants, flavors, and fragrances, and specialty chemicals

Product Advantages

High purity (≥98%), stable quality assurance

High reactivity, suitable for a variety of organic synthesis reactions

Direct supply from the source, high cost-effectiveness

Comprehensive documentation including COA, MSDS, TDS, etc.

Customized packaging available upon request

Company Advantages

Over 15 years of experience in organic synthesis and fine chemical export

ISO quality management system certification

Global export with comprehensive logistics channels

Technical team provides application formulation and synthesis advice

Long-term spot supply with short delivery times

Packaging and Storage

Packaging: 25kg/drum or custom packaging

Storage: Store in a cool, well-ventilated, airtight container away from sunlight

Shelf Life: 12 months (unopened)

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    • Boiling point: 126-127 °C/765 mmHg (lit.)
    • Melting point: 106.7°C (estimate)
    • Density: 1.258 g/mL at 25 °C (lit.)
    • refractive index: n 20/D 1.463 (lit.)

     

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    • CAS: 1119-51-3
    • Molecular Formula: C5H9Br
    • MDL Number: MFCD0000-364
    • Molecular Weight (g/mol): 149.031

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    • Physical State (20 deg.C): Liquid
    • Molecular Formula / Molecular Weight: C5H9Br = 149.03
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    CAS RN: 1119-51-3 | Product Number: B1474 5-Bromo-1-pentene Purity: >95.0% (GC) Synonyms: 4-Pentenyl Bromide

  11. People also ask

5-Bromo-1-pentene

5-Bromo-1-pentene Structure

5-Bromo-1-pentene structure

CAS No.
1119-51-3
Chemical Name:
5-Bromo-1-pentene
Synonyms
5-bromopent-1-ene;5c;3-Pentenylbromide;5-Bromopentene;5-bromo-pent-1-ene;5-b;C5H9Br;5-bromo-1-penten;-Bromo-1-pentene;5-BROMOPENTENE-1
CBNumber:
CB5251555
Molecular Formula:
C5H9Br
Molecular Weight:
149.03
MDL Number:
MFCD00000264
MOL File:
1119-51-3.mol
MSDS File:
SDS
Last updated:2026-09-23 17:18:35
Product description Number Pack Size Price
5-Bromo-1-pentene 95% 253901 5g $120
5-Bromo-1-pentene 95% 253901 25g $427
5-Bromo-1-pentene >95.0%(GC) B1474 5g $25
5-Bromo-1-pentene >95.0%(GC) B1474 25g $99
5-Bromo-1-pentene TRC-B686310-5G 5g $65
More product size

5-Bromo-1-pentene Properties

Melting point -106.7°C (estimate)
Boiling point 126-127 °C/765 mmHg (lit.)
Density 1.258 g/mL at 25 °C (lit.)
refractive index n20/D 1.463(lit.)
Flash point 30 °C
storage temp. 2-8°C
solubility Chloroform, Ethyl Acetate
form Oil
color Clear Colourless
Specific Gravity 1.258
Water Solubility Immiscible with water.
BRN 506077
InChI 1S/C5H9Br/c1-2-3-4-5-6/h2H,1,3-5H2
InChIKey LPNANKDXVBMDKE-UHFFFAOYSA-N
SMILES BrCCCC=C
CAS DataBase Reference 1119-51-3(CAS DataBase Reference)
NIST Chemistry Reference 1-Pentene, 5-bromo-(1119-51-3)
EPA Substance Registry System 1-Pentene, 5-bromo- (1119-51-3)
UNSPSC Code 12352100
NACRES NA.22

 

SAFETY

Risk and Safety Statements

Symbol(GHS) Flame (GHS02)Exclamation Mark (GHS07)
GHS02,GHS07
Signal word Warning
Hazard statements H226-H315-H319-H335
Precautionary statements P210-P302+P352-P305+P351+P338
target organs Respiratory system
PPE Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter
Hazard Codes Xi
Risk Statements 10-36/37/38
Safety Statements 26-24/25-16
RIDADR UN 1993 3/PG 3
WGK Germany 3
F 8
TSCA TSCA listed
HazardClass 3
PackingGroup II
HS Code 29033036
Storage Class 3 – Flammable liquids
Hazard Classifications Eye Irrit. 2
Flam. Liq. 3
Skin Irrit. 2
STOT SE 3
REACH Registrations Active
Limited Quantities 5.0 L (1.3 gallons) (liquid)
Excepted Quantities Max Inner Pack (30g or 30ml) and Max Outer Pack (1Kg or 1L)
NFPA 704
3
2 0

5-Bromo-1-pentene price More Price(63)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 253901 5-Bromo-1-pentene 95% 1119-51-3 5g $120 2026-04-30 Buy
Sigma-Aldrich 253901 5-Bromo-1-pentene 95% 1119-51-3 25g $427 2026-04-30 Buy
TCI Chemical B1474 5-Bromo-1-pentene >95.0%(GC) 1119-51-3 5g $25 2026-04-30 Buy
TCI Chemical B1474 5-Bromo-1-pentene >95.0%(GC) 1119-51-3 25g $99 2026-04-30 Buy
TRC TRC-B686310-5G 5-Bromo-1-pentene 1119-51-3 5g $65 2026-06-03 Buy

5-Bromo-1-pentene Chemical Properties, Uses, Production

Description

5-Bromo-1-pentene is an organic compound with a molecular weight of 149.03. The formula of this compound is C5H9Br. It is a colorless, transparent liquid. The molecular structure of this molecule contains both double bonds and bromine atoms, giving it the properties of olefins and halogenated hydrocarbons. It serves as the starting material for the synthesis of DL-histrionicotoxin and phenyl-ketone fatty acids. Additionally, it is a fundamental chemical and pharmaceutical intermediate, finding wide applications in the fields of medicine, pesticides, and material chemistry.

Chemical Properties

Clear colorless to yellow liquid

Uses

5-Bromo-1-pentene is widely utilized in the stereoselective synthesis of 7alpha-(3-carboxypropyl) estradiol. It plays an important role as starting material in the synthesis of a variety of compounds including DL-histrionicotoxin and benzophenone containing fatty acids.

Synthesis Reference(s)

Tetrahedron, 28, p. 675, 1972 DOI: 10.1016/0040-4020(72)84031-6

Synthesis

1,5-Dibromopentane (100 Kg), N, N-dimethylformamide (100 Kg), and hexamethylphosphoramide (6.2 Kg) were stirred and mixed, and then heated in an oil bath at 140°C for 4 h. Atmospheric distillation collects the fractions, and the collected fractions are washed twice with 100 Kg brine. The organic liquid is distilled to obtain product 5-Bromo-1-pentene.
5-Bromo-1-pentene

5-Bromo-1-pentene synthesis

111-24-0
1119-51-3
Synthesis of 5-Bromo-1-pentene from 1,5-Dibromopentane

5-Bromo-1-pentene Preparation Products And Raw materials

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