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Herbicides

Merphos

Also known as Tributyl phosphorotrithioite, Chemagro B-1776, Deleaf defoliant

CAS 150-50-5Formula C12H27PS3Molar mass 298.52 g/molEC 205-761-4
GHS signal word: Warning. Pictograms: Harmful or irritant 2 suppliers listed
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Merphos chemical structure, C12H27PS3, CAS 150-50-5
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Pale amber liquid
Boiling point
115 to 134
Density
0.99-1.01 @ 20 °C/4 °C
Flash point
146.1 °C
Solubility
SPARINGLY SOLUBLE IN WATER
HS code
293090
Category
Herbicides
UN number
UN 3278
Illustrative photo, an IBC tote of amber liquid in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Merphos?

Plain description, key identifiers and synonyms

Merphos is a chemical substance with the molecular formula C12H27PS3 and a molar mass of 298.52 g/mol. Its CAS registry number is 150-50-5. The IUPAC name is tris(butylsulfanyl)phosphane.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
tris(butylsulfanyl)phosphane
CAS number
150-50-5 CAS number cross-checked
EC number
205-761-4
Molecular formula
C12H27PS3
UNII
RN743HTX76
MDL number
MFCD00128008
InChIKey
KLAPGAOQRZTCBI-UHFFFAOYSA-N
InChI
InChI=1S/C12H27PS3/c1-4-7-10-14-13(15-11-8-5-2)16-12-9-6-3/h4-12H2,1-3H3
SMILES (canonical and isomeric)
CCCCSP(SCCCC)SCCCC

Synonyms

  • Tributyl phosphorotrithioite
  • Chemagro B-1776
  • Deleaf defoliant
  • Easy off-D
  • Tributylthiofosfin
  • Phosphorotrithious acid, tributyl ester
  • Tributyl trithiophosphite
  • Folex 6EC
  • Butyl phosphorotrithioite
  • Butyl phosphorotrithioite ((BuS)3P)
  • S,S,S-Tributyl trithiophosphite
  • S,S,S-Tributyl phosphorotrithioite
  • Phosphorotrithious acid, S,S,S-tributyl ester
  • tris(butylsulfanyl)phosphane
  • Tris(butylthio)phosphine
  • 4-01-00-01564 (Beilstein Handbook Reference)
  • Butyl phosphorothionate
  • S,S-Tributyl trithiophosphite
  • S,S-Tributyl phosphorotrithioite
  • Merphos 100 |Ig/mL in Acetonitrile
  • Merphos 100 microg/mL in Acetonitrile
  • S,S',S''-Tributyl phosphorotrithioite
  • Phosphorotrithious acid,S,S-tributyl 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
Pale amber liquidexp.
Odour
MILD CHARACTERISTIC ODORexp.
Boiling point
115 to 134exp.
Density
0.99-1.01 @ 20 °C/4 °Cexp.
Flash point
146.1 °Cexp.
Solubility
SPARINGLY SOLUBLE IN WATERexp.

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
298.52 g/molcalc.
Exact mass
298.1013 Dacalc.
LogP (octanol/water)
6.81calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
12calc.
Heavy atoms
16calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (1 violation)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H302Harmful if swallowed.
Precautionary statements (5)
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P301 + P317If swallowed: Get medical help.
  • P330Rinse mouth.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3278

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

Merphos suppliers

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

All 2 suppliers

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 1 country

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Merphos 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

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

Merphos is used to defoliate cotton @ 1.1 to 2.2 kg active ingredient/acre and can induce leaf abscission in some other plants, such as roses & hydrangeas.

Folex is particularly suited for total defoliation of cotton preparatory to machine harvesting because the natural action of folex causes the leaves to drop in a relatively green state with fresh weight adequate to cause them to fall to the ground.

Case: Merphos, Case No.: 2385, Pesticide type: Fungicide, Herbicide, Case Status: The pesticide is no longer an active ingredient in any registered pesticide products. Therefore, EPA is characterizing it as cancelled.

Use classes: Herbicides.

How it is made

Reaction of butyl mercaptan & phosphorus trichloride

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce, Regulatory flags: Added by a premanufacture notice

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2930.90Indicative HS code

Organo-sulphur compounds, other

World exports in 2024
$5.83B
+0.1% vs 2023, imports $5.93B
2019 to 2024
Top exporters
  1. China40.7%
  2. United States10.9%
  3. Japan9.3%
Top importers
  1. United States13.3%
  2. Brazil12.6%
  3. China6.6%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Merphos?

Merphos is a chemical substance with the molecular formula C12H27PS3 and a molar mass of 298.52 g/mol. Its CAS registry number is 150-50-5. The IUPAC name is tris(butylsulfanyl)phosphane.

What is the CAS number of Merphos?

The CAS registry number of Merphos is 150-50-5.

What is the molecular formula and weight of Merphos?

The molecular formula of Merphos is C12H27PS3 and its molar mass is 298.52 g/mol.

What is Merphos used for?

The active ingredient is no longer contained in any registered pesticide products ... "cancelled.". Merphos is used to defoliate cotton @ 1.1 to 2.2 kg active ingredient/acre and can induce leaf abscission in some other plants, such as roses & hydrangeas.

Is Merphos hazardous?

Merphos carries the GHS signal word "Warning". Main hazards: harmful if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Merphos?

Merphos is usually classified under HS code 293090 (Organo-sulphur compounds, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Merphos?

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

What is the price of Merphos?

Suppliers quote Merphos 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 Merphos

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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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