Abstract: The invention provides new methods for synthesis of large boron hydride clusters, e.g., boron hydride molecules of the formula BnHm where 5?n?96 and m?n+8, wherein m and n satisfy the electron counting rules of macropolyhedral boranes. The invention is particularly useful for synthesis of octadecaborane (B18H22). Preferred methods of the invention include iteratively generating a conjugate acid from a salt of the [BaHb]c? or [Bn+2Hm?4]2? anion followed by degradation under conditions conducive to concentrating and drying of the conjugate acid to provide a borane BnHm and residual salt of the [BaHb]c? or [Bn+2Hm?4]2? anion which is reused in the method of synthesis. The invention further provides isotopically enriched boranes, particularly isotopically enriched 10B18H22 and 11B18H22.

Abstract: The invention provides new methods for the synthesis of isotopically enriched metal borohydrides, metal tetrahydroundecaborate salts, and decaborane from isotopically enriched 10B-boric acid or 11B-boric acid. The invention is particularly useful for synthesis of isotopically enriched sodium or lithium borohydride, MB11H14 (where M is Li, Na, K, or alkylammonium), and decaborane.

Abstract: The invention provides new methods for synthesis of large boron hydride clusters, e.g., boron hydride molecules of the formula BnHm where 5?n?96 and m?n+8, wherein m and n satisfy the electron counting rules of macropolyhedral boranes. The invention is particularly useful for synthesis of octadecaborane (B18H22). Preferred methods of the invention include iteratively generating a conjugate acid from a salt of the [BaHb]c? or [Bn+2Hm?4]2? anion followed by degradation under conditions conducive to concentrating and drying of the conjugate acid to provide a borane BnHm and residual salt of the [BaHb]c? or [Bn+2Hm?4]2? anion which is reused in the method of synthesis. The invention further provides isotopically enriched boranes, particularly isotopically enriched 10B18H22 and 11B18H22.

Abstract: The invention provides new methods for synthesis of large boron hydride clusters e.g., boron hydride molecules of the formula BnHm where 5?n?96 and m?n+8, wherein m and n satisfy the electron counting rules of macropolyhedral boranes. The invention is particularly useful for synthesis of octadecaborane (B18H22). Preferred methods of the invention include iteratively generating a conjugate acid from a salt of the [BaHb]c? or [Bn+2Hm?4]2? anion followed by degradation under conditions conducive to concentrating and drying of the conjugate acid to provide a borane BnHm and residual salt of the [BaHb]c? or [Bn+2Hm?4]2? anion which is reused in the method of synthesis. The invention further provides isotopically enriched boranes, particularly isotopically enriched 10B18H22 and 11B18H22.

Abstract: The invention provides new methods for the synthesis of isotopically enriched metal borohydrides, metal tetrahydroundecaborate salts, and decaborane from isotopically enriched 10B-boric acid or 11B-boric acid. The invention is particularly useful for synthesis of isotopically enriched sodium or lithium borohydride, MB11H14 (where M is Li, Na, K, or alkylammonium), and decaborane.

Abstract: The invention provides new methods for the synthesis of isotopically enriched metal borohydrides, metal tetrahydroundecaborate salts, and decaborane from isotopically enriched 10B-boric acid or 11B-boric acid. The invention is particularly useful for synthesis of isotopically enriched sodium or lithium borohydride, MB11H14 (where M is Li, Na, K, or alkylammonium), and decaborane.

Abstract: The invention provides new methods for synthesis of B9H9?, B10H102?, B11H14?, and B12H122? salts, particularly alkylammonium salts of B9H9?, B10H102?, B11H14?, and B12H122?. More particularly, the invention provides methods of preparing tetraalkylamronium salts of B9H9?, B10H102?, B11H14?, and B12H122? by pyrolysis of tetraalkylammonium borohydrides under controlled conditions. The invention additionally provides methods of preparing, in an atom efficient process, octadecaborane from the tetraalkylammonium salts of the invention. Preferred methods of the invention are suitable for preparation of isotopically enriched boranes, particularly isotopically enriched 10B18H22 and 11B18H22.

Abstract: The invention provides new methods for synthesis of B9H9?, B10H102?, B11H14?, and B12H122? salts, particularly alkylammonium salts of B9H9?, B10H102?, B11H14?, and B12H122?. More particularly, the invention provides methods of preparing tetraalkylamronium salts of B9H9?, B10H102?, B11H14?, and B12H122? by pyrolysis of tetraalkylammonium borohydrides under controlled conditions. The invention additionally provides methods of preparing, in an atom efficient process, octadecaborane from the tetraalkylammonium salts of the invention. Preferred methods of the invention are suitable for preparation of isotopically enriched boranes, particularly isotopically enriched 10B18H22 and 11B18H22.

Abstract: The invention provides new methods for the synthesis of isotopically enriched metal borohydrides, metal tetrahydroundecaborate salts, and decaborane from isotopically enriched 10B-boric acid or 11B-boric acid. The invention is particularly useful for synthesis of isotopically enriched sodium or lithium borohydride, MB11H14 (where M is Li, Na, K, or alkylammonium), and decaborane.

Abstract: The invention provides new methods for synthesis of large boron hydride clusters e.g., boron hydride molecules of the formula BnHm where 5?n?96 and m?n+8, wherein m and n satisfy the electron counting rules of macropolyhedral boranes. The invention is particularly useful for synthesis of octadecaborane (B18H22). Preferred methods of the invention include iteratively generating a conjugate acid from a salt of the [BaHb]c? or [Bn+2Hm?4]2? anion followed by degradation under conditions conducive to concentrating and drying of the conjugate acid to provide a borane BnHm and residual salt of the [BaHb]c? or [Bn+2Hm?4]2? anion which is reused in the method of synthesis. The invention further provides isotopically enriched boranes, particularly isotopically enriched 10B18H22 and 11B18H22.