Cyclic thiatetraynes: syntheses and structural properties

摘要

The syntheses of three cyclic dithiatetraynes 4-6 with the sulfur atoms in propargylic positions are reported. Their structural features have been studied by means of X-ray analysis on single crystals. Additionally, six cyclic octathiatetraynes 15-20 with sulfur atoms in alpha,alpha'-positions to the triple bond have been prepared. The structures of 15 and 17 have been elucidated by means of X-ray analysis, These macrocycles exhibit an ellipsoidal geometry dominated by the stiff triple bond moieties. In the case of 4 a three-dimensional columnar structure is found, demonstrating the unique features of the potential cavities. [References: 22]