Benzo[3,4]cyclobuta[1,2-c]thiophen (2-thianorbiphenylene)
Abstract
The preparation of benzo[3,4]cyclobuta[1,2-c]thiophen (3) and benzo[3,4]cyclobuta[1,2-c]thiophen 2,2-dioxide (4) is described, and the occurrence of a paramagnetic ring current effect in (3) is discussed.