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Fungicides

Dithianon

Also known as Delan, Dithianone, Thynon

CAS 3347-22-6Formula C14H4N2O2S2Molar mass 296.33 g/molEC 222-098-6
GHS signal word: Warning. Pictograms: Harmful or irritant, Hazardous to the environment 28 suppliers listed
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Dithianon chemical structure, C14H4N2O2S2, CAS 3347-22-6
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Dark brown crystals, with a coppery luster
Melting point
220 °C
Density
1.58 g/cm³ at 20 °C
Flash point
>300
Solubility
In water, 0.14 mg/L at 20 °C
HS code
293499
Category
Fungicides
Illustrative photo, closed blue fibre drums on a pallet in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Dithianon?

Plain description, key identifiers and synonyms

Dithianon is a naphthodithiin that is 5,10-dioxo-5,10-dihydronaphtho[2,3-b][1,4]dithiin which is substituted by nitrile groups at positions 2 and 3. It is a broad spectrum fungicide used to control scab, downy mildew, rust, and leaf spot in the commercial growing of grapes and other fruit, citrus, coffee, and vegetables. It has a role as an antifungal agrochemical. It is a member of p-quinones, a dinitrile and a naphthodithiin.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
5,10-dioxobenzo[g][1,4]benzodithiine-2,3-dicarbonitrile
CAS number
3347-22-6 CAS number cross-checked
EC number
222-098-6
Molecular formula
C14H4N2O2S2
UNII
3ESS44NI1F
MDL number
MFCD00055492
InChIKey
PYZSVQVRHDXQSL-UHFFFAOYSA-N
InChI
InChI=1S/C14H4N2O2S2/c15-5-9-10(6-16)20-14-12(18)8-4-2-1-3-7(8)11(17)13(14)19-9/h1-4H
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C(=O)C3=C(C2=O)SC(=C(S3)C#N)C#N

Synonyms

  • Delan
  • Dithianone
  • Thynon
  • Delan-col
  • Merkdelan
  • Delan WP
  • Stauffer MV-119A
  • Delan (fungicide)
  • 1,4-Dithiaanthraquinone-2,3-dicarbonitrile
  • 1,4-Dithiaanthraquinone-2,3-dinitrile
  • 2,3-Dinitrilo-1,4-dithia-9,10-anthraquinone
  • MV 119A
  • 2,3-Dinitrilo-1,4-dithia-anthraquinone
  • IT 931
  • 2,3-Dicarbonitrilo-1,4-diathiaanthrachinon
  • 2,3-Dinitrilo-1,4-dithioanthrachinon
  • 2,3-Dicyano-1,4-dithia-anthraquinone
  • CADOL
  • 5,10-Dihydro-5,10-dioxonaphtho(2,3-b)-p-dithiin-2,3-dicarbonitrile
  • 5,10-Dihydro-5,10-dioxonaphtho(2,3-b)-1,4-dithiin-2,3-dicarbonitrile
  • Naphtho(2,3-b)-p-dithiin-2,3-dicarbonitrile, 5,10-dihydro-5,10-dioxo-
  • Naphtho(2,3-b)-1,4-dithiin-2,3-dicarbonitrile, 5,10-dihydro-5,10-dioxo-
  • 5,10-dihydro-5,10-dioxonaphtho[2,3-b]-1,4-dithiin-2,3-dicarbonitrile
  • Naphtho[2,3-b]-1,4-dithiin-2,3-dicarbonitrile, 5,10-dihydro-5,10-dioxo-
  • 5,10-dioxo-5H,10H-naphtho[2,3-b][1,4]dithiine-2,3-dicarbonitrile
Show all 34 synonyms
  • Naphtho[2,3-b]-p-dithiin-2,3-dicarbonitrile, 5,10-dihydro-5,10-dioxo-
  • 5,10-dioxo-5H,10H-naphtho(2,3-b)(1,4)dithiine-2,3-dicarbonitrile
  • 5,10-Dioxo-5,10-dihydronaphtho[2,3-b][1,4]dithiine-2,3-dicarbonitrile
  • 2,3-Dicyano-1,4-dithiaanthraquinone
  • 5,10-dioxobenzo[g][1,4]benzodithiine-2,3-dicarbonitrile
  • 2,3-Dinitrilo-1,4-dithiaanthraquinone
  • 1,3-dinitrile
  • 2,4-dithioanthrachinon
  • 2,4-diathiaanthrachinon

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
Dark brown crystals, with a coppery lusterexp.
Odour
Odorlessexp.
Melting point
220 °Cexp.
Density
1.58 g/cm³ at 20 °Cexp.
Flash point
>300exp.
Solubility
In water, 0.14 mg/L at 20 °Cexp.
Vapour pressure
2.03 × 10⁻¹¹ 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
296.33 g/molcalc.
Exact mass
295.9714 Dacalc.
LogP (octanol/water)
2.15calc.
Topological polar surface area
81.72 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
6calc.
Rotatable bonds
0calc.
Heavy atoms
20calc.
Rings
3calc.
Aromatic rings
1calc.
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, O=c1c2sccsc=2c(=O)c2ccccc12

O=c1c2sccsc=2c(=O)c2ccccc12

3 rings, 16 atoms.

No other chemical in our database has 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.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (7)
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P273Avoid release to the environment.
  • P301 + P317If swallowed: Get medical help.
  • P330Rinse mouth.
  • P391Collect spillage.
  • P501Dispose of contents and container in accordance with local regulations.

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

Dithianon suppliers

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All 28 suppliers
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Where suppliers are based

28 suppliers in 10 countries

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Dithianon price

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Uses and applications

What the substance is used for, by industry and function

Fungicide against many foliar diseases of pome & stone fruit but not against powdery mildews.

Fungicide ... used as a ... seed dressing.

Pathogens controlled include Venturia spp (apple, cherry, & pear), Microthyriella rubi (apple), Coccomyces hiemalis & Stigmina carpophila (cherry), Monilia spp, Taphrina deformans & Tranzschelia discolor (apricot & peach), Plasmopara viticola (grape), Pseudoperonospora humuli (hop), Elsinoe fawcetti, & Phomopsis citri (citrus), Mycosphaerella fragrariae, & Diplocarpon earliana (strawberry), Colletotrichum coffeeanum (coffee), Cronartium ribicola, Drepanopeziza ribis, & Plasmopara ribicola (currant).

Fungicide. Controls scab, downy mildew, rust, and leaf spot in some pome fruit, stone fruit, small fruit, wine growing, ornamentals, citrus, coffee, and vegetables. For use in intergrated pest management programs.

Use classes: Fungicides, Pesticides.

Roles

  • agrochemical
  • antifungal agent
  • antifungal agrochemical
  • antimicrobial agent
  • fungicide
  • pesticide

How it is made

Van Schoor et al, US patent 2,976,296 (1961 to E. Merck).

Made by the reaction of disodium 2,3-dimercaptomaleonitrile and 1,4-naphthoquinone.

Reaction of dichlone with 2,3-dimercapto-2-butenedinitrile.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 613-021-00-0

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2934.99Indicative HS code

Nucleic acids and their salts, other heterocyclic compounds, not elsewhere classified in heading 2934

World exports in 2024
$26.7B
+15.0% vs 2023, imports $26.3B
2019 to 2024
Top exporters
  1. Ireland26.3%
  2. China15.7%
  3. Singapore10.3%
Top importers
  1. United States24.5%
  2. Germany23.1%
  3. Japan4.5%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Dithianon?

Dithianon is a naphthodithiin that is 5,10-dioxo-5,10-dihydronaphtho[2,3-b][1,4]dithiin which is substituted by nitrile groups at positions 2 and 3.

What is the CAS number of Dithianon?

The CAS registry number of Dithianon is 3347-22-6.

What is the molecular formula and weight of Dithianon?

The molecular formula of Dithianon is C14H4N2O2S2 and its molar mass is 296.33 g/mol.

What is Dithianon used for?

Fungicide against many foliar diseases of pome & stone fruit but not against powdery mildews. Fungicide ... used as a ... seed dressing.

Is Dithianon hazardous?

Dithianon carries the GHS signal word "Warning". Main hazards: harmful if swallowed, very toxic to aquatic life, very toxic to aquatic life with long lasting effects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Dithianon?

Dithianon is usually classified under HS code 293499 (Nucleic acids and their salts, whether or not chemically defined, other heterocyclic…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Dithianon?

CompoundList lists 28 suppliers of Dithianon in Brazil, China, Germany, Argentina and 6 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Dithianon?

Suppliers quote Dithianon 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

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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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