Bis(acylsilanes) and Trifluoromethyltrimethylsilane: A Useful System for the Synthesis of Cyclic 2,2-Difluoro-3-trialkylsilyl-1,3-ketols and Cyclic 2-Fluoro-1,3-diketones<sup>1</sup>
silylketols 4. These compounds were submitted to a facile and effective defluorosilylation. The overall process constitutes a new synthesis of cyclic six- and seven-membered 2-fluoro-1,3-diketones 8, with regiospecific introduction of fluorine. The keto-enolequilibrium of cyclic 1,3-diketones and the mechanism of the defluorosilylation reaction were also studied.
New lactones having the formula ##STR1## wherein the cyclohexyl radical is bound to the carbon atoms at position 3 or 4 as indicated by the dotted lines, their use as perfuming ingredients and process for their preparation.