The trifluoride is produced from the trichloride by halide exchange. Aluminium hydride is prepared by treating lithium aluminium hydride with aluminium trichloride. Solutions containing ruthenium trichloride are highly active for olefin metathesis. A rare explosive form of antimony can be formed from the electrolysis of antimony trichloride. Hydrated aluminium trichloride is prepared by dissolving aluminium oxides in hydrochloric acid. The excess of boron trichloride was quenched in a mixture of potassium carbonate and methanol. It reacts with hydrogen chloride to form HPO and phosphorus trichloride. First prepared by mixing 3-chlorocyclopropene with antimony pentachloride, aluminum trichloride, or silver fluoroborate. Aluminum castings can be improved by treating the melt with boron trichloride vapors. They are prepared by reacting samarium trichloride with NaCH in tetrahydrofuran. This salt is prepared by treating an aqueous solution of ruthenium trichloride with 2,2'-bipyridine. Dioxane "poisons" this catalysis reaction by forming an adduct with aluminum trichloride. The protective group, benzyl, was then removed with boron trichloride in dichloromethane at . It is usually prepared by oxidation of ruthenium trichloride. Very high-purity vanadium is produced from a reaction of vanadium trichloride with magnesium.