Lawesson's reagent

Also known as: 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-disulfide, 4-Methoxyphenylthionophosphine sulfide dimer, LR, NSC 150550, 1,3,2,4-Dithiadiphosphetane, 2,4-bis(4-methoxyphenyl)-, 2,4-disulfide, 2,4-Bis(p-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-dithione, 2,4-Di(4-methoxyphenyl)-1,3,2λ⁵,4λ⁵-dithiadiphosphetane-2,4-dithione, 4-Methoxyphenylthiophosphoric cyclic di(thioanhydride)

Lawesson's reagent (CAS 19172-47-5) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C14H14O2P2S4 and a molecular weight of 404.467 g/mol. Key properties include a melting point of 228-230 °C(lit.), a boiling point of 525.8±60.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 271.8±32.9 °C. GHS signal word: Danger. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

19172-47-5

Jingsj CID

J-1990822-6

Molecular Formula

C₁₄H₁₄O₂P₂S₄

Molecular Weight

404.467 g/mol

Category

Organic Compounds

Last updated

8/21/2026