Radio Amplification by Stimulated Emission of Radiation (RASER) may produce very narrow NMR lines, background-free NMR spectroscopy, and excitation-free sensing of chemical transformations. Here, the authors show that pairwise addition of parahydrogen to various propargylic compounds induces RASER activity of other protons beyond those chemically introduced in the reaction via through-bond or through-space interactions.
- Ivan A. Trofimov
- Oleg G. Salnikov
- Igor V. Koptyug
