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. ... Reaction of metaltricarbonyl complexes of cyclen and cyclam with enolisable aldehydes or acid chlorides yields, after removal of the protecting M(CO) 3 moiety, selectively mono N-functionalized derivatives. ... Reaction of triprotected cyclen or cyclam with aldehydes or acid chlorides ...