FERROCENE AND ITS DERIVATIVES HAVE BEEN EMPLOYED FOR A VERY LONG TIME AS COMBUSTION CATALYSTS IN PROPELLANT COMPOSITIONS. IT HAS BEEN FOUND THAT THEIR PROPERTIES ARE IMPROVED BY THE ADDITION OF ORGANOSILYL RADICALS BOUND DIRECTLY BY CARBON-SILICON BONDS TO THE CYCLOPENTADIENYL NUCLEUS OF THE FERROCENE. SUCH COMPOUNDS ARE SYNTHESIZED FROM VARIOUS SYNTHETICROUTES, THAT THE MOST IMPORTANT OF THEM IS THE GRIGNARD REACTION [1].2TORGANOSILICON REAGENTS AND COMPOUNDS ARE VALUABLE IN ORGANICSYNTHESIS, SO METHODS TO SYNTHESIZE THEM HAVE BECOME OF CONSIDERABLE IMPORTANCE [2, 3].WE REPORT HERE SYNTHESIS OF 2T1, 1' - BIS [4- (DIMETHYLSILYL) BUTYL] FERROCENE BY A 2TGRIGNARD REACTION FROM1, 1' -BIS (4-CHLOROBUTYL) FERROCENE IN THF.1, 1' -BIS (4-CHLOROBUTYL) FERROCENE WAS PREPARED BY FRIEDEL-CRAFTS ACYLATIONOF FERROCENE WITH 4-CHLOROBUTYROYL CHLORIDE IN DICHLOROMETHANE INTHE PRESENCE OF ALCL3 AS CATALYST. 1, 1' -BIS (4-CHLOROBUTYROYL) FERROCENE WAS REDUCED TO 1, 1' -BIS (4-CHLOROBUTYL) FERROCENEBY NABH4 IN DIGLYME.