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. ... An efficient intermolecular carbonyl-alkyne reductive coupling reaction was realized for the first time by using the system, Sml 2 -HMPA-hydrogen donor, to give the corresponding allylic alcohols in good yields. ... For intermolecular addition of alkyl radicals to alkynes, see reference 1.