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- The authors thank Professor R.A. Olofson of the Pennsylvania State University, for his kind help in mechanistic interpretation
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- 1H NMR spectra were recorded at 60 MHz with a Hitachi Perkin-Elmer R - 600 spectrometer. The products exhibited physical and spectral characteristics in agreement with literature data (or with the structures for new compounds). Elemental analyses were performed by the “Central Microanalytical Department” of CNRS in Vernaison, France