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. ... The in situ acetal-containing Grignard reagent reacts with cyclic enones at −78°C to yield the product of conjugate addition in the absence of copper(I) salts. ... Cookies are used by this site. To decline or learn more, visit our Cookies page.