From straight chain to macrocyclic complexes containing mixed sulfur/nitrogen donors and coordinated 1,3-diynes

The propensity of aminothiophenols to facilitate the ring closure of propargylic cations derived from bis(propargyl alcohol)-Co4(CO)12 has been investigated and has revealed that only the 1,2-substitution pattern leads to a macrocyclic complex the result of a dual N,S-centered nucleophilic attack; attempts to extend the reactivity to 2-mercaptopyridine gave only straight chain products.