P. Brooks et al., The photochemical synthesis of naphtho[2,3-g]thiopheno[3,2-e]benzo[b]thiophene: A new heterocyclic system, SYNTHESIS-S, (8), 1999, pp. 1303-1305
The synthesis is described of the hitherto unknown 2,3-bis(2'-thienyl)napht
halene (1). Photochemical cyclisation of 1 affords naphtho[2,3-g]thiopheno[
3,2-e]benzo[b]thiopene (2), the parent compound of a new aromatic heterocyc
lic series.