Expanded cyclophanes Part 1. Synthesis and structure of 4,17- dithia[7.7]metacyclophane-1,6,14,19-tetrayne

Article abstract of DOI:10.1016/S0040-4039(98)00233-0

The title compound 3 was synthesized in three steps from 1,3- dibromobenzene in 26% overall yield. In the solid state, the molecule adopts a twisted anti conformation which does not correspond to any known conformation of its lower alkynylogue, 2,11-dithi