ARACHNO-CARBORANES, ARACHNO-BORANES AND THE CARBONIUM IONS C3H7(+) AND C4H7(+); NUCLEAR MAGNETIC RESONANCE ANOMALIES.
AEROJET-GENERAL CORP LOS ANGELES CALIF SPACE DIVISION CENTER FOR RESEARCH AND EDUCATION
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Two sets of hypotheses are presented. The first accounts for the carbon locations among the various position isomers of the carboranes, while the second attempts to cross-correlate most, perhaps all, of the 11B nmr ambiguities thus far reported on the basis of tautomerism involving specific structural elements in selected nido-boranes and all of the arachno-boranes. When taken together the two sets of hypotheses allow us to predict the most probable carbon position isomers among undiscovered and structurally unresolved carboranes and, fulfilling the primary objective of this study, reassures us that major ambiguities should not be anticipated in the spectra of all carboranes which contain two or more carbons. In selected cases the hypotheses can be extended to non-boron containing compounds. Norbornyl cation, for example, has been suggested to have the structure of an arachno-carborane it possesses the specific structural feature necessary to generate nmr ambiguities, and, indeed, it generates exactly the spectrum for such a tautomerizing system. Author
- Inorganic Chemistry
- Atomic and Molecular Physics and Spectroscopy