Abstract: Method for purifying metal halide precursors, and related compositions, related methods, and the like. A method comprises one or more of the following steps: obtaining a metal halide precursor, the metal halide precursor comprising a metal halide compound and at least one impurity; contacting the metal halide precursor with an oxygen-containing compound in a presence of a polar oxygen-free solvent to form a reaction product in solution; and separating the reaction product from at least one of at least a portion of the at least one impurity, at least a portion of the solution, or any combination thereof. Other compositions and methods are provided herein.

Abstract: The disclosure provides an improved method for preparing monoalkylated cyclopentadiene species in high yield and selectivity. In the process, either a solution of dicyclopentadiene magnesium or a cyclopentadiene magnesium halide is reacted with an alkylating agent in the presence of a modifying agent to provide the monoalkylated product. In the process of the disclosure, only a mono-alkylated species is produced with no detectible amount of dialkylated product observed.