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SiiCle is shown to be a catalyst for the cyclo-trimerization of both terminal and non-temiinal alkynes between 160-200 °C, e.g., cyclo-trimerization of PhC*CPh gave CePhg in 60% yield. The reaction involves formation of SiCU radicals. Si2(OMe)6 also catalyzes the cyclotrimerization of alkynes, but with lower conversions (yields). This represents the second example of such reactions facilitated by a non-metallic catalyst, as well as the first example proceeding by a radical pathway. 1. Reprinted with permission of American Chenucal Society. J. Am. Chem. Soc. 1998. 120. 6834-6835. 2. Graduate student and professor, respectively. Department of Chemistry, Iowa State University. 3. Primary researcher and author. 4. Author for correspondence. |
