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. ... Chelation controlled alkylation of optically active 1-alkoxy-1,4-cyclohexadienes leads to a mixture of 1,4-cyclohexadienes and 1,3-cyclohexadienes . The regio- and diastereoselectivities depend upon the nature of the chiral auxiliary and the reaction conditions.