chromones; heterocycles 11.3 Cyclizations with Iminium Salts 11.4 Synthesis and Reactions of 1,3,5-Tri- and 1,3,5,7-Tetracarbonyl Compounds Abstract: The reaction of 1,3-bis(silyloxy)-1,3-butadienes with f [...] chlorides and bis(acid chlorides) gives rise to the formation of a great variety of open-chained 1,3,5-tri- and 1,3,5,7-tetracarbonyl compounds and of cyclic products derived from them. Permethylated and cyclo [...] 2036-2045. Period of investigation: 1999 - 2011 Keywords: silyl enol ethers; 1,3-dicarbonyl compounds 11.5 Reactions of 1,1-Bis(silyloxy)ketene Acetals Abstract: 1,1-Bis(silyloxy)ketene acetals represent useful
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