Weak Ag center dot center dot center dot Ag and Ag center dot center dot center dot pi interactions in templating regioselective single and double [2+2] reactions of N,N '-bis(3-(4-pyridyl)acryloyl)-hydrazine: synthesis of an unprecedented tricyclohexadecane ring system

Synthesis of a stereospecific four-twelve-four fused tricyclic compound containing a tetraamide macrocycle has been achieved by the solid state [2+2] reaction through utilization of Ag center dot center dot center dot Ag interaction. The influence of anions on crystal packing has been utilized for the synthesis of a regioselective mono cyclobutane compound via the Ag center dot center dot center dot pi interactions.