CARBORANE FORMATION FROM ALKYNES AND BORANES. II. SLOW REACTIONS OF B4H10 AND B5H11 WITH ACETYLENE, METHYLACETYLENE AND DIMETHYLACETYLENE.
VIRGINIA UNIV CHARLOTTESVILLE DEPT OF CHEMISTRY
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It was previously reported J. Am. Chem. Soc. v89 p2557 1967 that the gas-phase interaction between tetraborane 10 and acetylene, takes place explosively at 100C to give volatile closo-carboranes, and at 25 to 50C proceeds slowly to form derivatives of the nido-carborane C3B3H7 in small yields. In an effort to better understand the general nature of the slow reactions, especially the formation of carborane cage systems, a detailed examination was made of the gas-phase reactions of B4H10 and B5H11 with several small alkynes. Since both B4H10 and B5H11 react with alkynes at room temperature the results of these studies, added to available data on other borane-alkyne systems, give some new indications of the role of borane structural features in reactions of this type. The extreme sensitivity of gas chromatography, coupled with mass spectroscopic, infrared, and nmr techniques, permitted the isolation and structural characterization of virtually all volatile products.
- Inorganic Chemistry