| abstract |
OF THE ABOVE-IDENTIFIED COMPOUNDS ONLY I,II,III, AND IV HAVE BEEN PREVIOUSLY PREPARED, SEE FOR EXAMPLE, L. H. KLEMM, C. E. KLOPFENSTEIN, R. ZELL, D. R. MCCOY AND R. A. KLEMM, J. ORG. CHEM., 34, 347 (1969) AND L. H. KLEMM, J. SHABTAI, D. R. MCCOY AND W. K. T. KIANG, J. HETEROCYCLIC CHEM., 5, 883 (1968). SEE NAMED RINGS ABOVE THIENO(3,4-B)PYRIDINE AND THIENO(3,4-C)PYRIDINE HAVE BEEN PREPARED. THERE ARE SIX THEORETICALLY POSSIBLE THIENOPYRIDINES, VIZ THIENO(2,3-B)PYRIDINE (I), THIENO(2,3-C)PYRIDINE (II), THIENO(3,2,-B)PYRIDINE (III), THIENO(3,2-C)PYRIDINE (IV), THIENO(3,4-B)PYRIDINE (V) AND THIENO(3,4-C)PYRIDINE (VI). |