No abstract

Sulfur bridging inlo the phenylpyridines, 2‐ and 3‐phenylquinolines, and the symmetric bi‐pyridines was effected by means of hydrogen sulfide and an alumina catalyst at 630° to give [1]benzothienopyridines, [1]benzothienoquinolines, and thienodipyridines, respectively. Structures of products were assigned on the bases of spectral and chromatographic studies, as well as of separate syntheses. Relative yields of the various products are rationalized in terms of a model for interaction between a chemisorbed sulfur atom and the substrate molecule.

No abstract

Treatment of phenanthrene with hydrogen sulfide and an alumina catalyst at 630° gives phenthro[4,5‐bcd]thiophene (XVII). Spectral properties of XVII, its sulfoxide, and its sulfone are presented. Other examples of the direct insertion of a sulfur bridging atom into an aromatic molecule are reviewed.