WO1999007712A1 - Preparation of tetraalkyl ammonium borohydrides - Google Patents
Preparation of tetraalkyl ammonium borohydrides Download PDFInfo
- Publication number
- WO1999007712A1 WO1999007712A1 PCT/US1997/014084 US9714084W WO9907712A1 WO 1999007712 A1 WO1999007712 A1 WO 1999007712A1 US 9714084 W US9714084 W US 9714084W WO 9907712 A1 WO9907712 A1 WO 9907712A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- borohydride
- alkali metal
- ammonium hydroxide
- aqueous solution
- tetraethyl ammonium
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic System
- C07F5/02—Boron compounds
- C07F5/022—Boron compounds without C-boron linkages
Definitions
- This invention is a method for the preparation of tetraalkyl ammonium borohydrides.
- a particulate solid alkali metal borohydride is added with agitation to a solution of tetraalkyl ammonium hydroxide in a non- interfering solvent to produce the desired tetraalkyl ammonium borohydride.
- the reaction is illustrated by the equation
- R is any straight or branched chain alkyl group, preferably an ethyl group, having one to ten carbon atoms
- M is any alkali metal, preferably sodium.
- the tetraalkyl ammonium hydroxide may be in solution in any non-interfering solvent, such as water, or an alkanol, such as methanol or ethanol. Water is the preferred solvent.
- any desired concentration for example, any 40% to 60% by weight solution of tetraalkyl ammonium hydroxide in a non-interfering solvent is useful in the practice of the invention.
- a commercially available 40% aqueous solution of tetraalkyl ammonium hydroxide may be utilized.
- the tetraalkyl ammonium hydroxide and alkali metal borohydride may be reacted in any desired relative proportions. Stoichiometric amounts are preferred.
- the reaction may be conducted at any desired temperature.
- a preferred temperature range is 20 °C. to 30°C.
- a specific embodiment of the invention entails addition of a particulate solid alkali metal borohydride to a 20% to 60% by weight aqueous tetraalkyl ammonium hydroxide solution. The addition is accomplished with agitation to facilitate solution of said alkali metal borohydride in said aqueous tetraethyl ammonium hydroxide. An exothermic reaction occurs readily at room temperature.
- aqueous alkali metal hydroxide or aqueous alkali metal alkoxide is added in an amount sufficient to cause separation of the reaction mixture into a lower aqueous alkali metal hydroxide or alkoxide containing layer and an upper aqueous layer containing the desired tetraalkyl borohydride as a hydrate, e.g., N(R) 4 + BH ⁇ 4 * 5H 2 0.
- the upper layer is separated and dried by vacuum or heat to provide solid ammonium tetraalkyl borohydride hydrate. Drying by heat is undertaken with care to avoid the decomposition of the product which may occur at a temperature of 260 °C.
- the dried product is purified by recrystallization from an appropriate solvent, preferably an alkanol such as methanol, ethanol or 2-propanol.
- an appropriate solvent preferably an alkanol such as methanol, ethanol or 2-propanol.
- alkali metal borohydride in solution in a non- interfering solvent may be combined with the tetraalkyl ammonium hydroxide solution.
- a solid alkali metal borohydride is cost effective and is preferred for other practical reasons.
- a 20% to 40% by weight aqueous alkali metal borohydride solution may be used in lieu of particulate solid alkali metal borohydride.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP51207199A JP2001518120A (en) | 1997-08-12 | 1997-08-12 | Preparation of tetraalkylammonium borohydride |
PCT/US1997/014084 WO1999007712A1 (en) | 1997-08-12 | 1997-08-12 | Preparation of tetraalkyl ammonium borohydrides |
CA002267979A CA2267979A1 (en) | 1997-08-12 | 1997-08-12 | Preparation of tetraalkyl ammonium borohydrides |
AU41478/97A AU4147897A (en) | 1997-08-12 | 1997-08-12 | Preparation of tetraalkyl ammonium borohydrides |
EP97939377A EP0937086A1 (en) | 1997-08-12 | 1997-08-12 | Preparation of tetraalkyl ammonium borohydrides |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1997/014084 WO1999007712A1 (en) | 1997-08-12 | 1997-08-12 | Preparation of tetraalkyl ammonium borohydrides |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999007712A1 true WO1999007712A1 (en) | 1999-02-18 |
Family
ID=22261427
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1997/014084 WO1999007712A1 (en) | 1997-08-12 | 1997-08-12 | Preparation of tetraalkyl ammonium borohydrides |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0937086A1 (en) |
JP (1) | JP2001518120A (en) |
AU (1) | AU4147897A (en) |
CA (1) | CA2267979A1 (en) |
WO (1) | WO1999007712A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2019083A1 (en) * | 2007-07-26 | 2009-01-28 | Rohm and Haas Company | Preparation of a hydrogen source for fuel cells |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2756259A (en) * | 1954-05-17 | 1956-07-24 | Metal Hydrides Inc | Method for preparing quaternary ammonium borohydrides |
US4216168A (en) * | 1978-10-16 | 1980-08-05 | Allied Chemical Corporation | Preparation of high purity tetrahydrocarbylammonium tetrahydridoborates |
-
1997
- 1997-08-12 AU AU41478/97A patent/AU4147897A/en not_active Abandoned
- 1997-08-12 CA CA002267979A patent/CA2267979A1/en not_active Abandoned
- 1997-08-12 EP EP97939377A patent/EP0937086A1/en not_active Withdrawn
- 1997-08-12 WO PCT/US1997/014084 patent/WO1999007712A1/en not_active Application Discontinuation
- 1997-08-12 JP JP51207199A patent/JP2001518120A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2756259A (en) * | 1954-05-17 | 1956-07-24 | Metal Hydrides Inc | Method for preparing quaternary ammonium borohydrides |
US4216168A (en) * | 1978-10-16 | 1980-08-05 | Allied Chemical Corporation | Preparation of high purity tetrahydrocarbylammonium tetrahydridoborates |
Non-Patent Citations (2)
Title |
---|
DATABASE CAPLUS ON STN, CHEMICAL ABSTRACTS, (Columbus, Ohio, USA), Abstract No. 85:103121, GUILLEVIC G., "Preparation of Tetraalkylammonium Borohydrides by Ion Exchange"; & BULL. SOC. CHIM. FR., August 1976. * |
DATABASE CAPLUS ON STN, CHEMICAL ABSTRACTS, (Columbus, Ohio, USA), Abstract No. 87:22361, CUEILLERON et al., "Tetraalkylammonium Borohydrides by Ion Exchange"; & FR,A,2 303 022, October 1976. * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2019083A1 (en) * | 2007-07-26 | 2009-01-28 | Rohm and Haas Company | Preparation of a hydrogen source for fuel cells |
Also Published As
Publication number | Publication date |
---|---|
AU4147897A (en) | 1999-03-01 |
EP0937086A1 (en) | 1999-08-25 |
CA2267979A1 (en) | 1999-02-18 |
JP2001518120A (en) | 2001-10-09 |
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