S. Oae et al., OCCURRENCE OF LIGAND COUPLING IN THE REACTION OF THE 2-THIENYL SULFOXIDES WITH ORGANOMETALLIC COMPOUNDS, Heteroatom chemistry, 4(2-3), 1993, pp. 185-188
Treatment of 2-pyridyl 2-thienyl sulfoxide with 2-thienyllithium was f
ound to give both 2-(2-pyridyl)thiophene 2 and 2,5-(di-2-pyridyl)thiop
hene 3. The reaction between 2-thienyllithium and thionyl chloride was
found to give 2,2'-bithienyl 8, a coupling product, which is also for
med by the reaction between di-2-thienyl sulfoxide 7 and 2-thienyllith
ium.