Silver trifluoromethanesulphonate
[CAS# 2923-28-6]

Identification

• Classification: Organic raw materials >> Organometallic compound >> Organic hafnium, mercury, silver, platinum, etc.
• Name: Silver trifluoromethanesulphonate
• Molecular Formula: CHF₃O₃S.Ag
• Molecular Weight: 256.94
• CAS Registry Number: 2923-28-6
• EC Number: 220-882-2
• SMILES: C(F)(F)(F)S(=O)(=O)[O-].[Ag+]

Properties

• Melting point: 286 °C

Safety Data

• Hazard Symbols: GHS07 Warning
• Risk Statements: H315-H319-H335
• Safety Statements: P261-P264-P264+P265-P271-P280-P302+P352-P304+P340-P305+P351+P338-P319-P321-P332+P317-P337+P317-P362+P364-P403+P233-P405-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - single exposure	STOT SE	3	H335
Eye irritation	Eye Irrit.	2	H319
Serious eye damage	Eye Dam.	1	H318
Skin corrosion	Skin Corr.	1B	H314
Eye irritation	Eye Irrit.	2A	H319
Acute hazardous to the aquatic environment	Aquatic Acute	1	H400
Skin corrosion	Skin Corr.	1	H314

Discovery and Applications

Silver triflate is well known for its unique properties and wide range of applications in organic synthesis and catalysis. This substance, also known as AgOTf, plays an important role as a Lewis acid catalyst in various chemical reactions, offering significant advantages over other catalysts in terms of efficiency and selectivity. Silver triflate was first synthesized and characterized in the context of developing new catalysts for organic transformations. It is formed by the reaction of silver oxide (Ag₂O) with trifluoromethanesulfonic acid (CF₃SO₃H), which results in the formation of AgOTf. The compound appears as a white to pale yellow solid that is soluble in polar solvents such as acetonitrile and dichloromethane.

Chemically, silver triflate consists of a silver cation (Ag⁺) coordinated to a trifluoromethanesulfonic acid anion (CF₃SO₃^-). This structure gives AgOTf unique properties, including high solubility in organic solvents and strong Lewis acidity. The trifluoromethanesulfonic acid group enhances the electrophilicity of the silver ion, making AgOTf an effective catalyst for promoting various organic reactions.

AgOTf is widely used as a catalyst in organic synthesis, especially in reactions favored by Lewis acid catalysis. It is used in processes such as Friedel-Crafts acylation, cyclization reactions, and nucleophilic substitution. In these reactions, AgOTf activates substrates by coordinating with electron-rich functional groups, thereby promoting bond formation and increasing reaction rates.

A notable application of AgOTf is in the synthesis of natural products and pharmaceutical intermediates. Its ability to activate carbonyl compounds and promote rearrangements makes it valuable in producing complex molecules with high stereochemical purity. In addition, AgOTf has been used to prepare functional materials and polymers, and its Lewis acid properties help control polymerization processes and material design.

The use of silver trifluoromethanesulfonate as a catalyst has several advantages over traditional Lewis acids. Its mild reaction conditions and compatibility with a wide range of substrates make it suitable for the synthesis of complex molecules. In addition, AgOTf generally has higher yields and selectivities than other catalysts, contributing to efficient and sustainable chemical processes.

Although AgOTf is valued for its catalytic capabilities, its use requires careful handling due to its potential toxicity and environmental impact. Proper disposal methods and adherence to safety procedures are essential to minimize the risk of exposure to silver compounds.

References

2016. Catalyst-Driven Scaffold Diversity: Selective Synthesis of Spirocycles, Carbazoles and Quinolines from Indolyl Ynones, _Chemistry (Weinheim an der Bergstrasse, Germany)_, 22(21)
DOI: https://doi.org/10.1002/chem.201601836

2009, Fluorination of Boronic Acids Mediated by Silver(I) Triflate, _Organic Letters_, 11(12)
DOI: https://doi.org/10.1021/ol901113t

2012, Generation of diverse 1-imidazolylisoquinolines via silver triflate-catalyzed reaction of 2-alkynylbenzaldoxime with imidazole, _Molecular Diversity_, 16(1)
DOI: https://doi.org/10.1007/s11030-012-9355-4