E. Alcalde et al., Polynucleating open-chain systems with imidazole and proton-ionizable 1,2,4-triazole structural motifs, J ORG CHEM, 66(7), 2001, pp. 2291-2295
A multistep route for obtaining the polynucleating open-chain systems 3-5 i
s reported. These advanced intermediates required elaborate processes that
proceeded for the pentanuclear proto-phanes 3 in seven steps, whereas the t
rinuclear compounds 4 and 5 were obtained in six steps.