Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... 3,5-dibromo-3,4-dihydro-2,2-dimethyl-(2H)-pyrans 2, are obtained through a simple and new procedure involving a bromoenol-etherification of γ,δ-unsaturated ketones 1; the key step is the formation of mono-bromopyran intermediate A. ... 3,5-dibromo-3,4-dihydro-2,2-dimethyl-( ...