... thiophen-7(4H)-one in the synthesis of condensed sulfur heterocycles Subhendu Sekhar Samanta, Sukhen Chandra Ghosh and Asish De * Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Calcutta-700 032, India ... References 1 Part 11, SS Samanta, S. Mukherjee and A. De, J. Chem. Res., 1996 (S), 128; (M), 0785. ... Chem., 1980, 17, 87. 23 S. Mukherjee and A. De, J. Chem. Res., 1994, (S), 295; (M), 1735. ...