1. Studies in the synthesis and interconversion of isomeric triazolothienopyrimidines
2. Studies on the synthesis of 2-(2-arylvinyl)thieno[2,3-d]pyrimidines and 5-(2-arylvinyl)triazolothieno[3,2-e]pyrimidines
3. We thank Dr. K. G. Dave, Hindustan Ciba-Geigy Research Centre, for helpful discussions, and Dr. S. Selvavinayakam, Hindustan Ciba-Geigy Research Centre, Bombay, for analysis and spectra. We are also indebted to Dr. B. M. Trivedi, Principal, L. M. College of Pharmacy, for providing facilities for carrying out this work and Mr. R. G. Patel for his interest in this work. Financial assistance by Mr. R. K. Patel, Vice-President, Par Pharmaceutical Inc., NJ, is gratefully acknowledged.