Affiliation: | 1. Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, 76100 (Israel), Fax: (+972)?89344142;2. Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, 76100 (Israel);3. Department of Chemistry, University of Rochester, Rochester, New York, 14627 (USA), Fax: (+1)?585‐2760205 |