Experimental Section All materials used were obtained from commercial sources and were not purified deuterated methanol (Sigma), quadricyclane (Aldrich), stannous chloride (Fischer), palladium chloride (Alfa), p-dichlorbenzene (Fischer). 'H NMR spectra were recorded at 60 MHz on a JEOL-FXGOQ pulsed NMR spectrometer. A spectral with width of 600 Hz was used with a single 90' pulse and 8K bits of data collection. Probe temperatures were measured with a ...