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  Home > JCE Print > Journal of Chemical Education > Issues > 2001  > July  >
In the Laboratory
Synthesis and Reactivity of the Metallaborane Complex [Mo(CO)4B3H8]- and the Formation of Mo(CO)4(dppe)
Craig M. Davis and Megan F. Klein
Department of Chemistry, Xavier University, Cincinnati, OH 45207-4221
Cover
July 2001
Vol. 78 No. 7
p. 952
Abstract
In this laboratory exercise the octahydrotriborate anion ([B3H8]-) is synthesized from sodium borohydride (NaBH4) and iodine in diglyme under a nitrogen atmosphere, and the sodium salt is converted to the tetrabutylammonium salt by a simple metathesis. Next, the metallaborane complex [(CO)4MoB3H8]- is prepared by refluxing a solution of Mo(CO)6 and (Bu4N)B3H8 in anhydrous 1,2-dimethoxyethane (glyme) under a nitrogen atmosphere. This solution is transferred via cannula to a flask containing the solid 1,2-bis(diphenylphosphino)ethane (dppe). The ensuing formation of [Mo(CO)4(dppe)] is nearly instantaneous. The syntheses of the two metal complexes proceed in very high yield. This exercise features inert-atmosphere syntheses and multinuclear (1H, 11B, and 31P) NMR spectroscopy and is suitable for upper-level undergraduates. The skills and ideas that are taught or reinforced include a general overview of borane clusters and the isolobal analogy, handling air-sensitive solutions, and internuclear coupling in NMR spectra.
Supplement
A student handout and notes for the instructor are available.
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*  Citation
 Davis, Craig M.; Klein, Megan F. J. Chem. Educ. 2001 78 952.
*  Keywords
 Boron; Molybdenum; Coordination Chemistry; Inorganic Synthesis; Laboratory Instruction; Metal Carbonyls
*  History
 Created:
Last Updated:		 June 6, 2001
August 31, 2005
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