SEARCH Articles Figures Tables 1.3- Dihydrothieno thiophenes, formation 2- Methyl-2,3-dihydrothieno -thiophene 2-Chloro-3,4-dihydrothieno 2-Chloro-3,4-dihydrothieno pyrimidines 2.3- Dihydrothieno pyridine 3.4- Dihydrothieno[2,3-d)pyrimidine 5.6- Dihydrothieno pyrimidine L-Oxo-2,3-dihydrothieno pyridine