________________________________________ * Author for correspondence; Ph.: (M) 09412167950; E-mail: hal.pathak58@gmail.com Int. J. Chem. Sci.: 9(3), 2011, 1285-1289 ISSN 0972-768X www.sadgurupublications.com STUDY OF THE REACTION OF CHALCONE DIBROMIDE WITH PHENYLTHIOUREA IN ABSENCE AND PRESENCE OF CAUSTIC POTASH GARIMA, VISHAL PATHAK * , PRAMILA SHARMA a and S. K. SHARMA b Department of Chemistry, Paliwal (P.G.) College, SHIKOHABAD – 205 135 (U.P.) INDIA a Department of Chemistry, Rajkiya Mahila (P.G.) College, PILIBHIT (U.P.) INDIA c Department of Chemistry, Bareilly College, BAREILLY – 243 003 (U.P.) INDIA ABSTRACT The present paper deals with the effect of the absence and presence of caustic potash in different molar ratios in the reaction of chalcone dibromide with phenylthiourea. The presence of KOH in different molar ratios did not alter the course of reaction. The end products were found to be the same. Key words: Chalcone dibromide, Phenylthiourea. INTRODUCTION Sharma and Bokadia 1 reported the reaction of alcoholic thiourea with chalcone dibromide to yield free sulphur in addition to chalcones. Panda et al. 2 carried out the condensation of chalcone dibromide with thiourea in refluxing ethanolic sodium ethoxide to yield two compounds, only one of which is identified as chalcone. Harode and Sharma 3 studied the reaction between chalcone dibromide and thiourea in presence of KOH. The products were characterized as 4, 6-diaryl-2-imino-1,3-thiazines. In the absence of KOH, the corresponding thiazines could not be detected. The reaction of α-bromochalcone with thiourea also resulted in the formation of corresponding thiazines. In continuation of our previous work on chalcone dibromide 4 , here We report the synthesis of the following chalcone dibromides.