Synthetic, Spectroscopic, and X‐ray Crystallographic Studies of [1,2,7,8]Tetrathiacyclododecino[4,3‐b:5,6‐b′:10,9‐b′′:11,12‐b′′′]tetraindoles

Abstract

Two conformationally different [1,2,7,8]tetrathiacyclododecino[4,3-b:5,6-bЈ:10,9-bЈЈ:11,12-bЈЈЈ]tetraindoles 9a and 9b have been isolated in good yields, and the existence of a third conformer 9c in solution was demonstrated by mass spectrometry and 1 H NMR spectroscopy. The interconversions of the tetraindoles 9a−c have also been studied. The conformation of 9b was confirmed by X-ray crystallography,