Abstract : Because of the high cost of o-carboranes a kinetic study designed to find out the mechanism of the reaction and to elucidate the factors influencing the reactions was carried out. The goal of this study was to provide information that would allow high yield syntheses of o-carboranes. It was found that acetylenes with electronegative substituents gave highest yields of o-carborane. Therefore, functional acetylenes such as HC = CCH2Br should be used to prepare precursors to other functional carboranes. Since migration of some carboranes out of solid propellants has been observed, a study was undertaken to synthesize functional carboranes capable of adding to polybutadiene binder successfully. However, the polymer properties were greatly altered and were therefore not acceptable for propellant studies.