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0.5 mL of S02 was slowly added a clear, homogeneous solution of magic acid (1 mL) in S02 (ca. 1 mL) at dry ice-acetone temperature with efficient vortex mixing. A cold aliquot was withdrawn with a precooled pipet (S02) and transferred into a 5-mm NMR tube under nitrogen, to which ca. 5 drops of cold CD2C12 had been added (vortex). NMR spectra were recorded at -65 °C.Molecular Modeling. MMX force field energy calculations on the sulfoxide substrates were carried out by using the pcmodel program (Serene Software). Good convergence was achieved after 100 iterations. The CSC angles were obtained directly from the minimized structures.search support and the Ohio Academic Challenge Program for the funds for a high-field NMR spectrometer.Solvolysis Rates and /9-Deuterium Secondary Kinetic Isotope Effects of Some Tertiary and Secondary Alk-5-enyl Derivatives. Evidence for ir-Participation

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