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| magic acid | |
|---|---|
| Name | Magic acid |
| Other names | fluorosulfonic acid–antimony pentafluoride mixture |
| Type | Superacid |
| Formula | HF·FSO3H·SbF5 (mixture) |
| Density | variable |
| Appearance | colorless to pale yellow liquid |
| Discovered | 1960s |
magic acid Magic acid is a highly corrosive superacid mixture notable for protonating hydrocarbons and stabilizing carbocations that are unstable in ordinary acids. It has been central to studies in physical organic chemistry, organometallics, and catalysis conducted at institutions such as Bell Labs, Harvard University, Massachusetts Institute of Technology, and Stanford University. Researchers including George A. Olah, Herbert C. Brown, and groups at DuPont and Allied Chemical helped develop methods and applications that exposed new reactivity patterns in organic and inorganic systems.
Magic acid refers to a binary superacid system formed from a strong Brønsted acid and a Lewis acid that together produce acidity surpassing that of pure sulfuric acid or neat triflic acid. Work on superacids intersects with investigations at Baylor College of Medicine, Ohio State University, University of Oxford, California Institute of Technology, and laboratories led by George A. Olah—recipient of the Nobel Prize in Chemistry—who used superacids to isolate long-sought carbocationic species. The term appears in literature alongside other powerful media such as fluoroantimonic acid and fluorosulfuric acid, and is referenced in the context of catalytic transformations explored at companies like ExxonMobil and Shell.
The canonical formulation mixes fluorosulfonic acid (FSO3H) with antimony pentafluoride (SbF5) to generate an acid medium whose Hammett acidity functions exceed those of conventional acids. Preparations are typically described in articles from journals published by American Chemical Society, Royal Society of Chemistry, and Wiley-VCH, and laboratory protocols derive from methods developed at industrial research centers formerly operated by Standard Oil and academic groups at University of California, Berkeley. Because SbF5 is moisture-sensitive and FSO3H is hygroscopic, synthesis is performed under inert atmospheres using equipment from suppliers like Sigma-Aldrich and techniques common in research at ETH Zurich and Imperial College London.
Physically, the mixture is a low-volatility, highly viscous, colorless to pale yellow liquid at ambient conditions; properties vary with composition and temperature as characterized in studies at National Institute of Standards and Technology and Los Alamos National Laboratory. Chemically, the medium exhibits extreme Brønsted acidity and strong Lewis acidity due to SbF5 coordination, producing stabilized protonated species and weakly coordinating anions akin to those observed in research at Bell Telephone Laboratories and IBM Research. Spectroscopic signatures have been explored using facilities such as Argonne National Laboratory and Lawrence Berkeley National Laboratory with techniques developed by investigators at Cornell University and University of Chicago.
Magic acid facilitates reactions that proceed via stabilized carbocations, enabling hydride shifts, skeletal rearrangements, and hydrogenolysis under conditions inaccessible to ordinary acids. Mechanistic frameworks draw on theories advanced by scholars affiliated with Princeton University, Yale University, Columbia University, and Johns Hopkins University. The medium can protonate alkanes and aromatic systems to form sigma-complexes and superelectrophiles, concepts elaborated in work at Tokyo Institute of Technology, University of Tokyo, and Seoul National University. Computational studies by groups at Max Planck Institute for Coal Research, Swiss Federal Institute of Technology Zurich, and University of Vienna have modeled potential energy surfaces and transition states characteristic of superacid-catalyzed processes.
Applications encompass synthesis of reactive intermediates, stabilization of unusual cations, and exploration of mechanistic pathways in hydrocarbon transformations relevant to petrochemical processes at firms like Chevron and BP. Academic uses include preparation of carbocation salts studied for aromatic substitution and polymerization initiation at University of Illinois Urbana-Champaign and Northwestern University. In organometallic chemistry, magic acid media have enabled generation of electrophilic metal centers investigated at University of Florida and University of Minnesota. Analytical and spectroscopic experiments leveraging superacid media have been reported in collaborations involving Brookhaven National Laboratory and Oak Ridge National Laboratory.
Due to extreme corrosivity and oxidative potential, handling protocols align with standards from Occupational Safety and Health Administration and European Chemicals Agency, and use of specialized materials and containment is informed by guidance from Centers for Disease Control and Prevention and institutional safety offices at universities such as MIT and Stanford. Personal protective equipment, acid-resistant gloves, fume hoods, and inert-atmosphere techniques are mandatory; waste disposal follows regulations administered by Environmental Protection Agency and local hazardous-waste authorities. Emergency procedures reference resources from American Red Cross and industrial safety programs practiced at DuPont and BASF facilities.
The discovery and naming of magic acid emerged during mid-20th century investigations into superacidity, with pivotal work in the 1960s and 1970s by researchers at Bell Labs, Case Western Reserve University, and University of Pennsylvania. Seminal publications by teams including George A. Olah documented unprecedented stabilization of carbocations and spurred further studies at institutions such as ETH Zurich and University of Cambridge. Subsequent decades saw extension of superacid chemistry across industrial laboratories at Exxon and academic centers like University of California, Los Angeles, shaping modern understanding of acid-catalyzed reactivity and informing contemporary research agendas at organizations including National Science Foundation and European Research Council.
Category:Superacids