“…The possible product, trialkoxy(aryl)cyclopropene or dialkoxy(aryl)cyclopropenylium ion, is readily hydrolyzed to give the ketones. 215 Reaction of trichlorocyclopropenylium ion with 1-trimethylsilyl-1-propyne 14 and trichloroethene 216 gave dialkynyl-and dialkenylcyclopropenones, respectively (eq 141).…”
“…The possible product, trialkoxy(aryl)cyclopropene or dialkoxy(aryl)cyclopropenylium ion, is readily hydrolyzed to give the ketones. 215 Reaction of trichlorocyclopropenylium ion with 1-trimethylsilyl-1-propyne 14 and trichloroethene 216 gave dialkynyl-and dialkenylcyclopropenones, respectively (eq 141).…”
“…Decarbonylation of cyclopropenones, which has been briefly discussed in section 2.6, was utilized for the synthesis of aromatic acetylenes. Thus, photolysis of 2-alkoxy-3-arylcyclopentenones, prepared from cyclopropenium ions, provided acetylenic ethers (Scheme ) . West made use of this method for obtaining an acetylene with anthrylphenol moieties 82 (Scheme ). , Oxidation of 82 with PbO 2 afforded quinone 83 .…”
“…Monoarylation of 37, using one equivalent of an arene followed by alcoholysis, produced dialkoxycyclopropenylium species 43 (Scheme 31). 69 The latter, after hydrolysis, afforded 2-alkoxy-3-arylcyclopropenones 44, useful pre-cursors for alkoxyarylacetylenes via thermal or photochemical CO extrusion. 69…”
Section: Scheme 30mentioning
confidence: 99%
“…69 The latter, after hydrolysis, afforded 2-alkoxy-3-arylcyclopropenones 44, useful pre-cursors for alkoxyarylacetylenes via thermal or photochemical CO extrusion. 69…”
In this review, a brief outline of synthetic methods toward cyclopropenes is provided. Main emphasis is placed on transformations of cyclopropenes proceeding with preservation of the ring, with a spotlight on recent developments in this area.
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