Lawesson's Reagent, CAS No. 19172-47-5

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19172-47-5

Catalog No. EBD571

CAS 19172-47-5

Name Lawesson's Reagent

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Basic Information

Synonyms: 2,4-Bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide Lawesson'sReagent 1,3,2,4-Dithiadiphosphetane,2,4-bis(4-methoxyphenyl)-,2,4-disulfide 19172-47-5 2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide 242-855-4 2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane2,4-disulfide p-Methoxyphenylthionophosphinesulfidedimer 2,4-bis(4-metho

Molecular Formula: C14H14O2P2S4

Molecular Weight: 404.47

MDL Number: MFCD00005171

Categories: Synthetic Chemistry > Basic Synthetic Reagents > Other Basic Synthetic Reagents Synthetic Chemistry > Organic Building Blocks > Phosphorus Compounds

Product Description:

Lawesson's reagent (LR), with the chemical formula C14H14O2P2S4, is a versatile organophosphorus compound widely used in organic synthesis. It is a dark red, crystalline solid known for its characteristic odor and sensitivity to moisture and air. Its primary and most significant application is as a thionation agent, effectively converting carbonyl groups (C=O) into thiocarbonyl groups (C=S). This transformation is crucial for the synthesis of various sulfur-containing heterocycles, such as thioamides, thioureas, thiolactones, and thioesters. It serves as a key reagent in the preparation of dithiophosphine ylides and plays a role in the synthesis of phosphorus-sulfur compounds. While Lawesson's reagent is a specialized and powerful synthetic tool, it is not typically used as a final product in pharmaceuticals, agrochemicals, or materials. Its role is firmly established in the research and development laboratory as a fundamental reagent for constructing complex molecular architectures, particularly those incorporating sulfur.

Physical Properties

Melting Point: 228-230 °C(lit.)

Boiling Point: 525.779 °C at 760 mmHg

Flash Point: 271.782 °C

Density: 1.489 g/cm3

Solubility: decomposes in water, soluble in part of the polar organic solvents

Storage: water-free area

Safety Information

Packing Level: II

Hazard Category: 6.1(4.3)

Transport Codes: 3134

Analytical Data

Appearance: light yellow to beige powder