Lawesson's reagent

Name: Lawesson's reagent
Brand: Vaqora Chemicals
SKU: VQ-000875

About Lawesson's reagent

Vaqora Chemicals supplies Lawesson's reagent, a synthetic reagent registered under CAS number 19172-47-5 at a purity of 97%. Its molecular formula is C14H14O2P2S4 and its molecular weight is 404.5 g/mol. Systematically, it is named 2,4-bis(4-methoxyphenyl)-2,4-bis(sulfanylidene)-1,3,2lambda5,4lambda5-dithiadiphosphetane. It is also known as P-Anisyldithiophosphonic anhydride or Lawesson reagent.

The product is provided as a powder. Reported physical data include a melting point of 228-230 °C. Store sealed in a dry, well-ventilated location away from incompatible materials. It carries the GHS signal word “Danger” with 4 hazard statements. Review the Safety Data Sheet before use.

Key uses span organic synthesis, reaction development, medicinal chemistry and catalysis. Buyers come mainly from academic and industrial research.

Standard pack sizes are 25 g, 100 g, 5 x 1 kg and 4 x 25 kg, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Organic synthesis
Reaction development
Medicinal chemistry
Catalysis

Industries

Specifications & identifiers

Chemical identifiers
Product name	Lawesson's reagent
Catalogue No.	VQ-000875
CAS Number	19172-47-5
IUPAC name	2,4-bis(4-methoxyphenyl)-2,4-bis(sulfanylidene)-1,3,2lambda5,4lambda5-dithiadiphosphetane
Molecular formula	C₁₄H₁₄O₂P₂S₄
Molecular weight	404.5 g/mol
Exact mass	403.9352
Purity / assay	97%
HSN code	29349900
InChIKey	CFHGBZLNZZVTAY-UHFFFAOYSA-N
SMILES	COC1=CC=C(C=C1)P2(=S)SP(=S)(S2)C3=CC=C(C=C3)OC
PubChem CID	87949

Physical properties
Physical form	Powder
Appearance	Powder
Melting point	228-230 °C
LogP (XLogP3)	6.1
H-bond donors / acceptors	0 / 6
TPSA	133 Å²
Synonyms	2,4-Bis(4-methoxyphenyl)-2,4-dithioxo-1,3,2,4-dithiadiphosphetane, 2,4-Bis-(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane 2,4-disulfide, 4-Methoxyphenylthiophosphoric cyclic di(thioanhydride), 1,3,2,4-Dithiadiphosphetane, 2,4-bis(4-methoxyphenyl)-, 2,4-disulfide, P-Anisyldithiophosphonic anhydride, Lawesson reagent, 2,4-Bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane 2,4-disulfide, Lawessons reagent, Lawesson' reagent, 2,4-Bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane 2,4-disulfide, 2,4-Bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide, 2,4-Bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane 2,4-disulphide

Safety & hazard information (GHS)

Flammable

Harmful / irritant

Signal word: Danger

Hazard statements

H261In contact with water releases flammable gas
H302Harmful if swallowed
H312Harmful in contact with skin
H332Harmful if inhaled

Precautionary statements: P231 + P232, P261, P264, P270, P271, P280, P301 + P317, P302 + P352, P304 + P340, P317, P321, P330, P362 + P364, P370 + P378, P402 + P404, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Lawesson's reagent?

The CAS Registry Number of Lawesson's reagent is 19172-47-5. It is also known as 2,4-Bis(4-methoxyphenyl)-2,4-dithioxo-1,3,2,4-dithiadiphosphetane, 2,4-Bis-(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane 2,4-disulfide, 4-Methoxyphenylthiophosphoric cyclic di(thioanhydride).

What is the molecular formula and molecular weight of Lawesson's reagent?

Lawesson's reagent has the molecular formula C14H14O2P2S4 and a molecular weight of 404.5 g/mol. Its IUPAC name is 2,4-bis(4-methoxyphenyl)-2,4-bis(sulfanylidene)-1,3,2lambda5,4lambda5-dithiadiphosphetane.

Which grade and pack sizes of Lawesson's reagent can I order?

We supply Lawesson's reagent in (97%) grade, in 25 g, 100 g, 5 x 1 kg, 4 x 25 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Lawesson's reagent?

Yes. Every lot of Lawesson's reagent is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Lawesson's reagent be shipped internationally?

Yes. Lawesson's reagent is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.