1-(Benzothiazol-2-yl)-4-phenylindeno-[1, 2-c] pyrazoles (1) and 1-(4-arylthiazol-2-yl)-4- phenylindeno [1, 2-c] pyrazoles (2) have been synthesised by the reaction between 1-oxo-3- phenylindan-2-carboxaldehyde (4) and 2-hydrazino-benzothiazoles or 2- hydrazinothiazoles.