Improved Methods for the Synthesis of KB₃H₈, NH₃B₃H₇, and N‑Alkyl Analogues of NH₃B₃H₇

Improved methods for the synthesis of KB₃H₈, NH₃B₃H₇, and N-alkyl analogues of NH₃B₃H₇ have been developed based on previous works. KB₃H₈ was synthesized by the reaction of metallic potassium (K) with borane dimethyl sulfide ((CH₃)₂S·BH₃) with high yield and atom-economy. In the preparation of NH₃B₃H₇ and its N-alkyl analogues, KB₃H₈ served as a starting material and was converted to THF·B₃H₇ first through reactions with HCl diethyl ether solution or oxidation agent CoCl₂. Then, the formed THF·B₃H₇ in situ reacted with the corresponding ammonia or amines to form the amine borane final products. This work paves an alternative way for preparing organic–inorganic hybrid materials containing B, N, and C atoms.