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Herbicides

Barban

Also known as Barbamate, Barbane, Carbyne

CAS 101-27-9Formula C11H9Cl2NO2Molar mass 258.10 g/molEC 202-930-4
GHS signal word: Warning. Pictograms: Harmful or irritant, Hazardous to the environment 2 suppliers listed
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Barban chemical structure, C11H9Cl2NO2, CAS 101-27-9
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Crystalline solid
Melting point
75 to 76
Boiling point
Degrades before boiling
Density
1.403 g/cm³ at 25 °C
Flash point
50 °C
HS code
292429
Category
Herbicides
UN number
UN 3077
Illustrative photo, closed white HDPE bottles and amber jars on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Barban?

Plain description, key identifiers and synonyms

Barban is a carbamate ester that is 4-chlorobut-2-yn-1-yl ester of N-(3-chlorophenyl)carbamic acid. A herbicide, it is no longer approved for use within the European Community. It has a role as a herbicide. It is a carbamate ester, an acetylenic compound and a member of monochlorobenzenes.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-chlorobut-2-ynyl N-(3-chlorophenyl)carbamate
CAS number
101-27-9 CAS number cross-checked
EC number
202-930-4
Molecular formula
C11H9Cl2NO2
UNII
33306K781F
MDL number
MFCD00045297
InChIKey
MCOQHIWZJUDQIC-UHFFFAOYSA-N
InChI
InChI=1S/C11H9Cl2NO2/c12-6-1-2-7-16-11(15)14-10-5-3-4-9(13)8-10/h3-5,8H,6-7H2,(H,14,15)
SMILES (canonical and isomeric)
C1=CC(=CC(=C1)Cl)NC(=O)OCC#CCCl

Synonyms

  • Barbamate
  • Barbane
  • Carbyne
  • Chlorinat
  • Carbin
  • Neoban
  • Carbyne (herbicide)
  • 4-Chlorobut-2-ynyl 3-chlorophenylcarbamate
  • Fisons B25
  • 4-Chloro-2-butynyl m-chlorocarbanilate
  • 4-chlorobut-2-yn-1-yl (3-chlorophenyl)carbamate
  • 4-Chloro-2-butynyl 3-chlorocarbanilate
  • 4-Chloro-2-butynyl N-(3-chlorophenyl)carbamate
  • Caryne
  • Carbamic acid, (3-chlorophenyl)-, 4-chloro-2-butynyl ester
  • 4-Chlorobut-2-ynyl-m-chlorocarbanilate
  • RCRA waste no. U280
  • Chloro-2-butynyl m-chlorocarbamate
  • 4-Chloro-2-butynylm-chlorocarbanilate
  • 2-Butynyl-4-chloro-m-chlorocarbanilate
  • 4-Chloro-2-butynyl meta-chlorocarbanilate
  • m-Chlorocarbanilic acid, 4-chloro-2-butynyl ester
  • 2-Butyn-1-ol, 4-chloro-, m-chlorocarbanilate
  • 4-Chloro-2-butynyl-m-chlorocarbanilate
  • (4-Chlor-but-2-in-yl)-N-(3-chlor-phenyl)-carbamat
Show all 38 synonyms
  • 4-Chloro-2-butynyl m-chlorophenylcarbamate
  • (4-Chloor-but-2-yn-yl)-N-(3-chloor-fenyl)-carbamaat
  • (4-Cloro-but-2-in-il)-N-(3-cloro-fenil)-carbammato
  • (3-Chlorophenyl)carbamic acid 4-chloro-2-butynyl ester
  • Carbanilic acid, m-chloro-, 4-chloro-2-butynyl ester
  • 4-Chloro-2-butynyl 3-chlorophenylcarbamate
  • N-(3-Chloro phenyl) carbamate de 4-chloro 2 butynyle
  • 4-chlorobut-2-yn-1-yl N-(3-chlorophenyl)carbamate
  • 2-Butynyl 4-chloro-m-chlorocarbanilate
  • 4-chlorobut-2-ynyl N-(3-chlorophenyl)carbamate
  • N-(3-Chloro phenyl)carbamate de 4-chloro 2-butynyle
  • Barbane [ISO-French]
  • Carbamic acid, N-(3-chlorophenyl)-, 4-chloro-2-butyn-1-yl ester

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

Appearance
Crystalline solidexp.
Odour
ODORLESS SOLIDexp.
Melting point
75 to 76exp.
Boiling point
Degrades before boilingexp.
Density
1.403 g/cm³ at 25 °Cexp.
Flash point
50 °Cexp.
Solubility
At 25 °C g/100 g solvent: benzene 32.7 g, n-butylbenzene 11.3 g, n-dodecane less than 0.1 g, n-hexane 0.14 g, isopropylbenzene less than 7.0 g, kerosene 0.39 g, toluene 25.7 g, 2,2,4-trimethylpentane more than 0.3 g, xylene 27.9 g, water…exp.
Vapour pressure
3.8 × 10⁻⁷ mm Hg at 25 °Cexp.

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
258.10 g/molcalc.
Exact mass
257.001 Dacalc.
LogP (octanol/water)
3.13calc.
Topological polar surface area
38.33 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
2calc.
Heavy atoms
16calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.18calc.
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, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H302Harmful if swallowed.
  • H317May cause an allergic skin reaction.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (14)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3077

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

Full safety data and first aid

Barban suppliers

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

All 2 suppliers
  • 1st Scientific LLC
    China, NanjingUnclaimed profile
    BarbanGrade, purity and minimum order on request
    Price on request
    View
  • Synblock Inc
    Canada, MontrealUnclaimed profile
    BarbanGrade, purity and minimum order on request
    Price on request
    View

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

2 suppliers in 2 countries

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Barban price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

The active ingredient is no longer contained in any registered pesticide products ... "cancelled.".

Selective post-emergence herbicide (Former use).

For postemergence control of ... canarygrass in barley, flax, lentils, mustard (grown for oil), peas, safflower, sugar beets, wheat, semi-dwarf wheat, sunflower and soybeans. For postemergence control of Italian ryegrass in barley, flax, lentils, mustard (grown for oil), peas, safflower, sugar beets, wheat, semi-dwarf sunflower, and soybeans in California and Oregon. (Former use).

Use classes: Herbicides.

Roles

  • herbicide
  • pesticide

How it is made

Condensation of 4-chloro-2-butyn-1-ol with m-chlorophenylisocyanate

By the reaction of 3-chlorophenyl isocyanate with 2-butyne-1,4 diol, followed by chlorination with thionyl chloride in an inert solvent.

US patent 2906614 (1959 to Spencer Chem)

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 006-020-00-6

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2924.29Indicative HS code

Cyclic amides (including cyclic carbamates) and their derivatives, salts thereof, other

World exports in 2024
$5.69B
−5.1% vs 2023, imports $5.8B
2019 to 2024
Top exporters
  1. China32.3%
  2. Switzerland * partner reported13.6%
  3. Norway * partner reported12.8%
Top importers
  1. United States15.9%
  2. Ireland15.8%
  3. Germany11.9%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Barban?

Barban is a carbamate ester that is 4-chlorobut-2-yn-1-yl ester of N-(3-chlorophenyl)carbamic acid. A herbicide, it is no longer approved for use within the European Community. It has a role as a herbicide. It is a carbamate ester, an acetylenic compound and a member of monochlorobenzenes.

What is the CAS number of Barban?

The CAS registry number of Barban is 101-27-9.

What is the molecular formula and weight of Barban?

The molecular formula of Barban is C11H9Cl2NO2 and its molar mass is 258.10 g/mol.

What is Barban used for?

The active ingredient is no longer contained in any registered pesticide products ... "cancelled.". Selective post-emergence herbicide (Former use). For postemergence control of ...

Is Barban hazardous?

Barban carries the GHS signal word "Warning". Main hazards: harmful if swallowed, may cause an allergic skin reaction, very toxic to aquatic life. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Barban?

Barban is usually classified under HS code 292429 (Cyclic amides (including cyclic carbamates) and their derivatives, salts thereof, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Barban?

CompoundList lists 2 suppliers of Barban in Canada and China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Barban?

Suppliers quote Barban 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 Barban

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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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