Carbocations are key intermediates in many organic reactions—especially SN1 substitutions and rearrangements—but they normally rearrange within nanoseconds, making direct observation difficult. Olah employed superacids such as “magic acid,” a mixture of fluorosulfuric acid and antimony pentafluoride, to stabilize carbocations at room temperature and analyze them by NMR. This proved that structures students had previously seen only in textbook arrows truly exist, and it clarified numerous reaction mechanisms. The knowledge helped improve catalytic cracking, design high-octane gasoline and, more recently, guides developments in greener chemical processes.

Olah exploited the extraordinary protonating power generated by the synergistic Lewis acidity of SbF5 and the Brønsted acidity of FSO3H to generate tert-butyl, benzene-ring σ-complex (benzenium ion), and even methyl cations at or near room temperature. Using ^13C and ^1H NMR together with IR spectroscopy, he quantified bond lengths and charge distributions, providing experimental support for Hückel theory and hyperconjugation concepts. Protonated aromatics and directly trapped methyl cations in superacids informed catalyst design for iso-octane synthesis and methanol-to-gasoline conversions. Beyond pure mechanistic studies, Olah advocated the “methanol economy,” envisioning a recyclable carbon loop based on CO2 hydrogenation to methanol.

Using the FSO3H–SbF5 system (Hammett acidity H0 ≈ −19), Olah isolated a broad range of carbocations—including nonclassical bridged ions such as 2-norbornyl—and recorded the first static NMR spectra at 293 K. Large downfield ^13C shifts, combined with DFT computations, provided direct experimental evidence for three-center–two-electron σ bonding and allowed quantification of hyperconjugative stabilization energies. He further demonstrated mechanistic parallels with protonated hydrocarbons on perovskite-type solid superacids and proposed a concerted Brønsted/Lewis model for acid solid catalyst design. Olah’s CO2 tri-alcohol process, integrated with Ru-pincer catalyzed hydrogenation, outlined an industrial roadmap for the methanol economy. These insights continue to guide research on C–H activation, polyolefin cracking, and on-site fuel production technologies.