55660-74-7Relevant academic research and scientific papers
Cycloaddition reactions of sulfonylisothiocyanates with β,β-disubstituted enamines
Schaumann,Sieveking,Walter
, p. 4147 - 4152 (2007/10/05)
Sulfonylisothiocyanates 1 and β,β-dimethylenamines 2 react to yield the dipoles 3. In nonpolar solvents an equilibrium exists between 3 and the thietanes 4. The free activation enthalpy for the ring closure 3→4 was obtained from the temperature dependent NMR spectra in liquid sulfur dioxide. Protonation of 3 with perchloric acid leads to the salts 8 which, as indicated by ΔG≠-values obtained from NMR spectra, are also capable of ring closure.
