Fusion of the structural motifs 21,23-dithiaporphyrin and acetylene yields the 18-π-aromatic [18]triphyrin(4.1.1) framework (see structure; C gray, N blue, S yellow). The butyne moiety that joins the two thiophene rings reveals a slight distortion from linearity, showing a bowlike deformation directed out of the macrocycle.
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Berlicka et al. (2005) studied this question.
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