Semequip, Inc.

Bernard Spielvogel

Kevin Cook

Kevin S Cook

The invention provides new methods for synthesis of large boron hydride clusters, e.g., boron hydride molecules of the formula BHwhere 5&#x2266;n&#x2266;96 and m&#x2266;n+8, wherein m and n satisfy the electron counting rules of macropolyhedral boranes. The invention is particularly useful for synthesis of octadecaborane (BH). Preferred methods of the invention include iteratively generating a conjugate acid from a salt of the [BH]or [BH]anion followed by degradation under conditions conducive to concentrating and drying of the conjugate acid to provide a borane BHand residual salt of the [BH]or [BH]anion which is reused in the method of synthesis. The invention further provides isotopically enriched boranes, particularly isotopically enrichedBHandBH.

Isotopically-enriched boranes and methods of preparing them

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

Methods of synthesis of isotropically enriched borohydride and methods of synthesis of isotropically enriched boranes

The invention provides new methods for synthesis of large boron hydride clusters e.g., boron hydride molecules of the formula BHwhere 5&#x2266;n&#x2266;96 and m&#x2266;n+8, wherein m and n satisfy the electron counting rules of macropolyhedral boranes. The invention is particularly useful for synthesis of octadecaborane (BH). Preferred methods of the invention include iteratively generating a conjugate acid from a salt of the [BH]or [BH]anion followed by degradation under conditions conducive to concentrating and drying of the conjugate acid to provide a borane BHand residual salt of the [BH]or [BH]anion which is reused in the method of synthesis. The invention further provides isotopically enriched boranes, particularly isotopically enrichedBHandBH.

Methods of synthesis of isotopically enriched borohydride and methods of synthesis of isotopically enriched boranes

The invention provides new methods for synthesis of BH, BH, BH, and BHsalts, particularly alkylammonium salts of BH, BH, BH, and BH. More particularly, the invention provides methods of preparing tetraalkylamronium salts of BH, BH, BH, and BHby 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 enrichedBHandBH.

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Hubbards, Canada

Bernard Spielvogel