Crystal structures of dibenzo[ce]-1,2-dithiine and its related oxides

The X-ray structures of dibenzo[ce]-1,2dithiine, dibenzo[ce]-1,2-dithiine-5,5-dioxide, dibenzo[ce]-1,2-dithiine-5,5,6-trioxide, and dibenzo[ce]-1, 2-dithiine-5,5,6,6-tetraoxide are reported and compared with the related "constrained" naphthalene derivatives. The S-S distances vary upon oxidation of the S centers in the order S-S < SO-S > SO2-S < SO2-SO > SO2-SO2 i.e. the most oxidized sulfur atoms do not lead to the longest bond lengths. (c) 2005 Wiley Periodicals, Inc.