Abstract:

The reactions of seven carbon tethered internal alkynyl cyclopropanol silyl ethers under the catalyzation of cationic gold or silver af
forded the corresponding α,βunsaturated enone with the highest yield of 78%. The structures of these compounds were identified by IR, ¹ H NMR, ¹³C NMR spectra. The mechanism of cycloreaction was also dicussed.

Key words: cationic gold or silver, internal alkynyl, intramolecular carbocyclization, reaction mechanism