The role of ammonia in promoting ammonia borane synthesis

Ammonia promotes the synthesis of pure ammonia borane (AB) in excellent yields from sodium borohydride and ammonium sulfate in tetrahydrofuran under ambient conditions. An examination of the influence of added ammonia reveals that it is incorporated into the product AB, contrary to its perceived fun...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2016-01, Vol.45 (41), p.16433-16440
Main Authors: Ramachandran, P Veeraraghavan, Kulkarni, Ameya S
Format: Article
Language:English
Subjects:
Ammonia
Boranes
Borohydrides
Catalysts
Dehydrogenation
Sodium
Synthesis
Tetrahydrofuran
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Summary:Ammonia promotes the synthesis of pure ammonia borane (AB) in excellent yields from sodium borohydride and ammonium sulfate in tetrahydrofuran under ambient conditions. An examination of the influence of added ammonia reveals that it is incorporated into the product AB, contrary to its perceived function as a catalyst or a co-solvent. Mechanistic studies point to a nucleophilic attack by ammonia on ammonium borohydride with concurrent dehydrogenation to yield AB.
ISSN:1477-9226
1477-9234
DOI:10.1039/c6dt02925f